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U1: Uncle Wiggily
Solved: Uncle Wiggily and the Alligator

U2: UFO's and aliens
I'd like to find a copy of a science fiction book I read in the mid 1950's. I don't remember the title or author but the main characters were three young men who were involved with crashed UFOs and alien technology. One of the characters was an electronics whiz. Any ideas?

Maybe one of the Rick Brant Electronic Boys series? They were written by John Blaine in the late 1940s. Rick and his friend Scotty lived on Spindrift Island with Rick's father and other scientists and solved mysteries. No idea about UFOs, though. Maybe The Rocket's Shadow 1947?
Raymond F. Jones, SON OF THE STARS. 1952.
Jones, Raymond F., Son of the Stars, Winston 1957.  More information on the suggested title, but it doesn't confirm anything. "In 'Son of the Stars', Raymond Jones has written of a forthright friendship between a young castaway from space and his earthly counterpart. How a cold and suspicious military, recognizing Clonar only as an alien from an astonishingly advanced civilization, turns friendship into treachery that threatens earth's existence, makes this an electrifying story with a thought-provoking theme. In scenes uncomfortably vivid, you'll meet soldiers and citizens of a typical American city  people like calculating General Gillispie and frightened Mrs. Barron, whose reactions to an 'interplanetary' situation bring the world to the brink of destruction.." The term 'castaway' suggests that there may be UFO crash technology involved, but only the alien boy Clonar and his friend young Barron are mentioned, not 3 boys. If it helps, Clonar has 6 fingers.
I don't know the teens and UFOs novel sought, but it's none of the Rick Brant series.  Rick Brant gets involved in some mildly sftish situations with new inventions and such, but the only trace of aliens in the whole series are some thousand-year-old ambigious radio signals from space picked up in THE EGYPTIAN CAT MYSTERY.

U5: Unexpected wilderness survival esperience
This is a book about either a boy or a boy and an adult friend that went for a hiking experience in the mountains. They wind up with a snow storm that strands him/them in a high valley for the winter. The book talks about the things that had to be improvised to survive. I believe it talked about tanning deer hide. And I think there was some reference to cinnabar (an ore from which mercury is derived). It seems the book ends as spring arrives and he/they are able to return home.

#U5--Unexpected wilderness survival experience:  The plot is somewhat like Walt Morey's Canyon Winter, but not enough to be the book described.  The main differences are that the stranding was due to a plane crash and I don't believe there's anything about deer hide tanning or metal ore--just a lot about tree conservation. The deer hide tanning is like My Side of the Mountain, but that wasn't an accidental experience--Sam did spend the
winter, and did have a friend, but went up there on purpose.  It is also definitely not Viereck's Terror on the Mountain, as that takes place during the summer.
Would this be one of the Gary Paulsen books?  I was reminded of either The River or Hatchet.  Neither match exactly, though.
U5 unexpected wilderness survival: Not an exact match, but there's Lone Woodsman, by Warren Hastings Miller, illustrated Kreigh Collins, published Winston 1943, 230 pages. Dan Pickett loses all his supplies when his canoe capsizes on Lac Seul, leaving him with his belt knife, swim trunks, and dog Pepper. He makes his way to Factory St. Joseph to meet his father, foraging for food, killing animals with a hand-made bow and traps, tanning hides, smoking meat and so on. He loses supplies and shelter once to a wolverine and once to a moose. Diagrams are provided for several of the things he makes. Couldn't find a reference to cinnabar, though. Most of the journey takes place in snowy weather.
Jean Craighead George, My Side of the Mountain.  A long shot.  Parts of the plot don't match, but the parts about a boy tanning deerskin and surviving a winter alone in the mountains do.
U5: Unexpected wilderness survival experience - just a note from the original poster of this puzzle. I have checked in every few months and pursued the suggestions. In fact, I have enjoyed purchasing and reading My Side of the Mountain. Unfortunately, none of the suggestions is the book I remember. Thanks for making this forum available - and I hope someone will yet be able to help me find this book.
Hobbs, Will, Far North, 1996. You might take a look at Far North by Will Hobbs. Two teenage boys and an elderly man (who dies part way through) are stranded for the winter in a high valley in Canada's Northwest Terr. after a float plane accident.

Farley Mowat, Lost in the Barrens, 1956, This mystery reminded me of this book, which I really enjoyed as a kid. Some elements sound similar but it may not be the one either. Either way, thanks for reminding me of it!

U6: Upon my word
Solved: Alice and Jerry primers

U7: Upset house
Solved: The House That Had Enough
U8: Under One Roof

Solved: Under one roof


U9: Underground river with families living on rafts
Solved: Journey Outside 
U10:  Unicorn healing

Solved: The Beast with the Magical Horn

U11: Underground lost world
Solved: The Perilous Descent

U12: unicorn & geraniums
Solved: The Little White Horse

U13: underground stream or bush bower
book was read in the late 1940's or early 1950's by teacher in a rural school for children 6-12 years old.  In book children had a bower on a hill made of brush or tall weeds. Also there was a portion that talked of a river or stream that ran under a house.  There was a ladder that went down into the stream.

Goudge, Elizabeth, Henrietta's House, London, Hodder, 1942.  I wonder if it might be this. Henrietta, her brother Hugh
John, and assorted adults go for a picnic in the hills. The story blends fantasy and reality. There is a sinister hulking gatekeeper who is like the Giant who had no heart in his body, and an old gentleman who builds bowers in the forest for imagined Sleeping Beauty and Babes in the Woods, and a mysterious house fitted up just as Henrietta had dreamed. Hugh John and the Bishop find an underground river and a boat, and go down it, to find a robbers' den and the place where the young saint of the hills may have prayed. I believe there is a ladder out of the den.

U14: Useful Cart
believe it was published in UK, c. 1970.  described all the uses children found for a wagon. not a lot of text, no plot.

Mollie Clarke, The Useful Cart, 1966. No description, but the title's right, it was published in the UK, and there was a
reprint in 1969.
U14 Do you want me to look in Petersham's The Box with Red Wheels to see?
I don't think The Box With Red Wheels fits the description; it's a very short story about some animals wondering what could be inside that box with red wheels (it turns out to be a baby).
Donald Hall, Ox-Cart Man, 1979. Could this be Ox-Cart Man by Donald Hall? Man who has a wife and two kids on a farm loads up the Ox-Cart each year and sells everything in it for presents/goods for the family including the cart itself at the end. Then the story starts over again.

U15: undersea animals (starfish, etc.) interact
Solved: The Garden Under the Sea

U16:  Unicorn awakes after 500? years
Solved:  Unicorn Magic

U17: Up the Hill
Solved: Up the Hill

U18: Utensils teach child to cook
Solved: The Mary Frances Cook Book

U19a: Under the Sea
Solved: Valley of the Song

U19b: US sailor with smuggled puppy
1955 - 1958. I remember a book about a US sailor (homesick?) in a ship in the Med Fleet, peacetime, post WWII. He finds (and smuggles aboard)a puppy while on shoreleave in an Italian(?) port. Many adventures later, the book ended and simultaneously broke my heart and began a life filled with the great joy found on the printed page. This was the first "real book" I read. Borrowed it from the Carrol Park Branch of the Brooklyn Public Library.

U20: Ugly (or evil) dolls
I have only foggy memories of this book, but what stands out is that the protagonist(s) are afraid of a certain house or person because this person (an old woman?) makes really ugly dolls with patches for eyes, and yet the dolls seem to "watch" people and know what they're up to. It was really creepy and it seems to me that these dolls, as well as the protagonists, are part of some mystery. Any help would be appreciated.

U20 Sounds like it could be REVENGE OF THE DOLLS by Carol Beach York, 1979. Definitely creepy. The old aunt makes ugly evil dolls. They do not have patches for eyes, tThey have glass button eyes, and they do watch. Although, as revenge for Paulie destroying one of her dolls, she creates a sinister pirate doll which has an eye patch. So it might be worth looking at. ~from a librarian

U21: Underground City Children Escape
Solved: This Time of Darkness

U22: Unfortunately
Solved:  Fortunately


U23: Up the stairs
Solved: Surprise for Sally

U24: Under the ? Tree
Solved: Beyond the Pawpaw Trees

U25:  Unfinished Stories (Illustrated)
Solved: The Mysteries of Harris Burdick


U26:  Under the Maple Tree
Solved: Miracles on Maple Hill

U27: Upside down book
I am looking for a book published in  the late 1940's or early 1950's. I don't remember anything about it except  that you had to turn the book upside down and there was another related story that you read when you turned the book upside down at the end of the first story. I know this is very farfetched, but it is a book that I loved when I was in kindergarden around 1958-59 and I want to locate it and buy it for my granddaughters.

There are several Wonder and Elf books that fit this upside-down theme: Good Morning and Good Night by Frank Luther, The Goody-Naughty Book and The Sunny-Sulky Book by Sarah Cory Rippey, and  The Goody Naughty Book by Mabel Watts.  If these were longer juvenile stories, there's a whole series of Dandelion Books, but the stories aren't necessarily related.  Check the Solved Mysteries pages to see if any of these work.
Upside down books.  I had one of these books in the 50's when I was a child.  It wass called Just Like Mummy/Just Like Daddy.
Charlotte Zolotow, When I Grow Up???, 1950's.  CZ has  a book like this where one side is a little girl, "when I grow up, I can wear party dresses to school, etc."  The other side is a little boy. Maybe this?
Margriet Heymans Annemie, The Dolls' Party
Annemie and Margriet Heymans, The Doll's Party.

U28: Underground Railroad
Solved: Steal Away Home

U29: Umbrella, hat and broom
I had a book when I was a kid in the 70s....it was a collection of stories and one included an umbrella, a hat and a broom - they could talk and I think it was a rainy day and they found something to keep themselves busy.....  It's driving me NUTS!

I want to say that this is an Enid Blyton story.  There's a vauge recollection of having read this, and I had a lot of the Blyton short story collections as a child.  However, there are a lot of short story collections of hers to check!  The smuggler's cave and other stories has a story called "The surprising broom."
I think this sounds a lot like Stumper D186.  Both have unbrellas, which seems unusual.

U30a: Umbrella
Hi, I am looking for a book I read as a child around 1968-1972.  Story was about a young girl and her adventures.  Something somewhat magical from what I remember.  The only clue I can offer is that at one point she had to jump from a cliff so she opened her UMBRELLA and she drifted safely down to the ground.

Brown, Palmer, Beyond the Pawpaw Trees.  When I read this stumper, my first thought was of this book.  Didn't she always carry her umbrella?  And the description of her jumping off a cliff and floating down with her umbrella sounds familiar.
Palmer Brown, Beyond the pawpaw trees: the story of Anna Lavinia, 1954.  I also think this could be the book you're looking for. Maybe some of this description will sound familiar?  Pages 60-63 of the 1973 Camelot Book reprint describe how Anna Lavinia has thrown stones, a tea cosy and a jar of pawpaw jelly over the cliff and noticed a peculiar phenomenon. She has then watched her cat Strawberry fall over the edge of the cliff with no ill effects.  She decides she has no choice but to follow him, pushing a carpet bag and gardenia bush over the edge ahead of her. "Finally, just to be on the safe side, she opened her umbrella and reached into her pocket to squeeze the silver key for good luck.  Then she took a deep breath and stepped off into the air."
Just to confirm, U30 is indeed Beyond the Pawpaw Trees: The Story of Anna Lavinia by Palmer Brown. I just read it a few weeks ago and remember the scene quite clearly.

U30b: Uncle sends lion skin for birthday, boy gets back at sisters
After all these years, I am still seeking a PICTURE BOOK about a little BLACK BOY (maybe in an urban setting) who is picked on by his MEAN SISTERS. At one point his sisters lock the boy in a CLOSET and eat his birthday cake while he watches through the KEYHOLE. And all they save for him is a candle with a little bit of cake stuck to the bottom! His uncle sends a LION SKIN (head and all--like a rug), or some other large cat, from somewhere abroad (Africa perhaps), and with it, he's able to scare the beejeebers out of his sisters and exact revenge.  My best guess is that it could have been published between 1960 and 1975, definitely not as late as 1980.  While the plot is remarkably similar, it is not JAMES THE JAGUAR, by Mary Lystad, illustrated by Cyndy Szekeres (1972).   Please help!  Thank you.

This description is nearly identical to B282, which is still unsolved.
Also, just so you know, I was indeed the one who posted B282--perhaps two years ago.  I too hope the mystery is solved soon.
Ruth Cavin, Timothy the Terror, 1972.  Very rare and hard to find, expensive too (saw a copy for sale which cost $104.99). Great story though.

U31: Unicorn Tapestry Mystery
Solved: Secret of the Unicorn

U32: ufo short stories humor flying saucers
Weekly reader or Scholastic magazine had a special issue that had short humorous stories about flying saucer experiences.  My recollection is that they were penned by Buddy Hackett (the late comedian).  One story starts "I was flying my private plane to Lubbock Texas to bomb some people whose religious proclivities I didn't wholly agree with"  another ends with a description of the effects on a mans wife "she had to be pulled around on a dolly and could only communicate with the aid of a hand puppet". Any assistance in finding these stories would be greatly appreciated. Thanks!

U32 Do they remember if it was 8 1/2 x 11?  If so, it might be this:  The Scholastic Funfact book of UFOs.  Scholastic, 1977.
U32 Please keep trying :-) The short stories I'm trying to find were purely fiction. Thanks.

U33: Unicorn book with necklace
I'm looking for a kids book about a unicorn.  The book was probably published in the late 70s or early 80s, and the book came with a little necklace (I believe the necklace had a unicorn on it as well).  I know that's not much info to go on, but I'm trying to find both the book and necklace for a friend.  If anyone has any ideas I would really appreciate it!

Perhaps it was one of the books by Elizabeth Koda-Callan. She wrote a bunch of books that came with charm necklaces around that time and some are still in print, I think. Good Luck!
Thank you for the response.  I checked into this author, though, and she doesn't appear to have written any books about unicorns.  Also, my friend who had the book was a boy, and these are all books for little girls.
Scholastic frequently packaged necklaces or such that related to a books subject.  Escape of the Unicorn by Suzanne Lord or Sarah's Unicorn by Bruce Coville were both publish by Scholastic in that era.

U34: "Underground Railroad" Jeanie Quakers Orphan
Solved: Voices in the Night

U35: Upside-down or backwards book
I am not sure of the correct term but it was an "upside-down or backwards book" with 2 stories in one book both about a child's bedtime, sleep, not wanting to go to bed.  I am pretty sure that there were 2 Covers, 2 titles, 2 fronts to the book. You would read in one direction , one story. Flip the book over and there was another cover and another story.  The 2 stories were on reverse pages, upside down, as I recall , if you looked over the page of story #1.  Year I read this would have been in the early 1950's, maybe even the late 1940's.  One story was about a little girl who did not want to go to sleep and stayed up all night wandering through the empty house, as I recall.   the other story , when you  flipped the book, was about what goes on in the house when everyone is asleep.   I just recall it was quite clever and really got the message across that it was better to go to sleep than stay up all night,.  I would so love to find this book  Thanks for any help.  Such a cool web site.  I was able to solve one of them...

U36: Uncle-niece thing
Solved: Me, My Goat, and My Sister's Wedding

U37: Underground monsters
This is a book I read in the late 50's.  I am very vague about it, but it was fairly large and had many full page black and white or sepia drawings.  It had as many pictures as a normal picture book but more writing.  A boy goes ?underground in a ?castle, or possibly down a well and comes to a world with many strange and grotesque creatures.  It's more like an art book, can't really remember the plot, but I think he has to try to get out.  I'm not certain if the creatures are threatening him or not.  Not much to go on, I know!

Could this be George MacDonald's The Princess and the Goblin? You can read it online here.
Thanks, but it's definitely not The Princess and the Goblin.  It's not a fairy or folk tale, I'm sure, but a modern fable of some kind, with the emphasis on the artwork and strange underground monsters.
I remember reading this book but i haven't a clue waht it's called, although i recall the pictures looking vaguely like those in where the wild things are by maurice sendak, maybe it was by him?

U38: Unicorns
Solved: The Secret of the Unicorn Queen


U39: Underground maze
Solved: The House of Stairs

U40: Utah pioneer
Solved: The Great Brain Series

U41: Underground Society
I happened to browse onto your page in search for This Time of Darkness.  I also have a very (quite similar) issue.  I am also looking for a book about an underground society.  Since you seemed to be (somewhat) versed, at least reading three books on the subject ( This Time of Darkness, Outside and The City Under Ground), I was hopeing you can help me out.  When I was a kid, I read 1/2 way threw a book and my mom returned it, without my knowledge, and we just never bothered getting it out of the library again (something I truly regret).  So anyway, this is what I remember from the book:
* The society did live underground
* The main character was not over the age of a teenager...but most likely pre-pubesent.  Not sure of the gender, but I think it was male.
* There was a scene with a "town meeting" where the male and female adults stood on opposite sides of the room (maybe a theme of segregation?) and the children were either not present or split from both groups of adults.
* The main character describes a "beating" he received for looking up a "smoke stack" to the surface to see the sky.  Something that was obviously forbidden.
* The main character and his/her friends went exploring, following "train tracks" to somewhere...something i believe was also forbidden.
The last two bullets, the overall idea I'm sure is correct, but I am fuzzy on the details.

Zilpha Keatley Snyder, Below the Root, 1975.  I think you're looking for the Green-sky trilogy - the books are "Below the Root", "And All Between", and "Until the Celebration".  The novels are about a planet with two different groups of people - the Kindar, who live in villages in the treetops and wear long, wing-like outfits that allow them to glide from tree to tree, and the Erdlings, who have been imprisoned underground and developed an industrialized society.  A Kindar teenager named Raamo is invited to join the ruling council, and finds out about the existence of the Erdlings.  The clues you provide sound a lot like descriptions of the Erdling tunnels.
The book or series described in the query wouldn't be Green-sky. No child abuse (almost no violence at all) or gender segregation in those books. Could you be remembering two different series with similar ideas?
Ayn Rand, Anthem, 1937. Not everything matches, but you might be looking for ANTHEM.
Jean Duprau, City of Ember. The plot sounds like Duprau's book about Ember, where people had gone to escape some coming global catastrophe. By the time of the book, two children had discovered a route "up there". The time doesn't sound right for it though.


U42: Uncle gloves mansion cabin snakes wash basin
This is a paperback book I read about 10 yrs ago, might have been written sometime in early 90's: A boy is sent to live with his evil aunt and uncle in a giant old creepy mansion (I believe he is orphaned, and he might have had a sister who went too...)   His uncle and aunt put him to very hard labor; his hands get very blistered, and  on his birthday, they only give him work gloves (!).  In his bedroom, there is a scary wash basin painted with a scene of a very chaotic and violent cavalry battle (that happened a few hundred years ago).  Eventually, the boy flips over the basin and finds a secret passage, which he follows down to find a log cabin buried deep within the house where a nice old lady lives, who helps him.  He even crosses a snake pit at one point, I think.  I forget how the happy ending wraps up...

U43: Uncle Popacatapetl
I dimly recall reading, circa 1965, a children's fantasy novel which I suspect was published at least thirty years earlier. The book was written in third-person narration, but always focusing on the child protagonist (as in Alice in Wonderland or The Wizard of Oz) The main character was a little boy I can't remember his name for certain, but it might be Peter. At one point in this book, the boy meets a very jolly bald fat man whose name is Uncle Popacatapetl. I'm pretty sure of that spelling. In real life, there is a volcano in Mexico named Popocatapetl notice the spelling difference.I don't remember the name of the book's author or illustrator. At one point, there is an illustration when the boy meets a lot of human or humanoid figures. One of the figures is a pair of tongs or a pair of pliers walking upright, with a male human face. The strange thing about these figures is that they seem to be parodies of the "Happy Families": these are characters in a children's card game which is very popular in Britain, similar to American children's games such as Old Maid and Go Fish, except that Happy Families requires a special dedicated card deck. I think that these characters in this book even have names similar to the names in the Happy Families card deck: Mister Cutts the Butcher, and so forth: surnames linked to a trade, and punning on it. I get the impression that this novel was written and published in America (I saw it in a shipment of books from the USA), but the presence of the Happy Families characters might indicate that the book originated in Britain. Any ideas?

Not a direct solution, but I found reference to your Uncle P. character being in a book titled Alternative Alices (Twenty stories by different authors giving an alternative picture of the heroine of Lewis Carroll's 1865 novel, Alice's Adventures in Wonderland. Often less flattering than the original, they were written between 1869 and 1930) --   so here's the contents of that book.  Hopefully, you'll recognize the story you're looking for in there.  Contents: Mopsa the fairy : Reeds and rushes;  Queen's wand;  Failure / Jean Ingelow -- Amelia and the dwarfs / Juliana Horatia Ewing -- From Speaking likenesses / Christina Rossetti -- Behind the white brick / Frances Hodgson Burnett -- Wanted-a king, or, how Merle set the nursery rhymes to right / Maggie Browne -- New Alice in the old wonderland : Peggy the pig;  Dutchess and her house;  Tweedles
 Pageant / Anna M. Richards -- Justnowland / E. Nesbit -- Ernest / Edward Knatchbull-Hugessen -- From nowhere to the north pole: a Noah's ark-æological narrative : How Frank fared in Teumendtlandt;  What happened to Frank in Quadrupedremia / Tom Hood -- Down the snow stairs, or, from good-night to good-morning : naughty children land / Alice Corkran -- Davy the goblin, or what followed reading "Alice's adventures in wonderland" : the moving forest / Charles E. Carryl -- Wallypug of why : Way to why;  Breakfast for tea;  Girlie sees the wallypug;
 What is a goo? / G.E. Farrow -- New adventures of "Alice" : Found in the attic;  To Bunberry Cross, or along came a snipe;  Peevish printer
 Fire!! / John Rae -- Uncle Wiggily in wonderland : Uncle Wiggily and wonderland Alice;  Uncle Wiggily and the march hare;  Uncle Wiggily and the cheshire cat / Howard R. Garis -- From David Blaize and the blue door / E.F. Benson -- Westminster Alice : Alice in Downing street;  Alice in Pall Mall;  Alice and the liberal party / Saki -- Clara in Blunderland : in a hole again / Caroline Lewis -- Alice in Blunderland, an iridescent dream : off to Blunderland;  ownership of children / John Kendrick Bangs -- Alice and the stork: a fairy tale for workingmen's children : Alice visits the American eagle / Henry T. Schnittkind -- Alice in the delighted states : Through the drinking glass;  Jealous island;  Humble pie
 Censor incensed / Edward Hope
Benson, E. F., David Blaize and the Blue Door,1918. Acting on the above information, I found that the story in the book Alternative Alices with Uncle Popacatapetl is "David Blaize and the Blue Door," by E. F. Benson.  I'm not certain it's the right book, because there is only an excerpt available in that book, but it seems like a good lead!

U44: Upside Down Land
Thanks GOD for this site! There is one book I’ve been looking for this book for YEARS! Please help! I used to take this book out from the library when I was very very young, maybe 15 or 20 years ago. It was in the Children’s section, one of those thin hardcover picture books. I remember that the cover was brown and possibly and the cartoonish picture on it like the inside of the book. What I REALLY remember is the pictures. The story was about a young boy who traveled to all these different worlds. Like most picture books there wasn’t a lot of words but big pictures of these worlds. One of them was an “Upsidedown land” where everyone walked with their shoes on their hands and birds flying upside down and people walking around doing handstands. Then he traveled to a chocolate World (possibly Chocolate and Marshmallow it was all brown and white) Actually that was the world that reminded me of the book (Anyone else seen the Chocolate Quik commercial where everything turns to chocolate – that’s what triggered my memory) Now this book looked like it was written in early 80s, possibly older (by a few years, nothing more than 60s) Please Please help!

James Flora, Pishtosh, Bullwash, and Wimple.One of my favorites as a child.  A boy has three friends (Pishtosh, Bullwash, and Wimple) that take him on wonderful adventures.  One place is upside down land, another is growly forest (where trees growl), another is chocolate lake (my favorite!) where they go fishing for marshmallow fish with vanilla wafer fins and he catches a big chocolate fish with a peanut eye.  Once he catches a peppermint turtle.  At the end of the book they have to find the north pole (taken by a polar bear to share with his homesick relatives in a zoo) before all the gravity spills out of the earth.  They replace it in the nick of time, just as everything is floating off of the earth.
Not a solution, but this sounds similar to a book I've been trying to unearth from my memory for a long time. The one I read would have been in the 70s.
Mattel, Upsy-Downsy Land,1969.You may be thinking of Upsy-Downsy Land - one of our all-time favorite books!  It lists no auther - just "Mattel."  Brilliantly colored cartoon pictures where everyone walks on their hands...

U45: Unfinished picture book
Solved: The Mysteries of Harris Burdick

U46: Uncle Toby, boys adventures
I vaguely remember 2 boys in a children's book who had an uncle Toby who sent them on really fantastic, almost surreal trips.  I think there was a series of the books.  Sadly, I can't remember much else.

Gordon Boshell, Captain Cobwebb.  That could be this long series - the uncle was Septimus Cobwebb (and was invisible) but Toby was one of the boys (his older brother was David). If Fanty the elephorse, the Leopillar, the Golden Cactus, the shershl (an invisible bus) and/or being kidnapped by a sort of ground-effect horseshoe crab with tentacles ring any bells then the requester's looking for this.

U47: Ugly Duckling
The Ugly Duckling, publication date approx. between 1950-1960; large edition, approx. 8 1/2" x 11"; white boards; final page in book has small drawing in a box centered in upper half of the page (maybe a plain white page after that).  Good luck!!  I've spent a LONG time looking!

U48: Upside Down Hatbox Cake
I am looking for a children's book from my childhood. It featured a group of animal characters that acted like people. There was a Mrs. Duck (I think - some kind of "Fowl") The premise of the book is that there is a village fete going on where baked goods will be sold. "Mrs. Duck" makes a cake and places it in a Hatbox on a shelf in her closet to cool. When she goes to retrieve the cake it tips upside down. She's upset, but takes the cake anyway. It sells and the folks want more! She makes another, puts it in the Hatbox and turns it upside down. The "Up side down Hatbox Cake" is born. Any of this sound familiar? I got the book from my Elementary School Library.  It might have been part of a collection of stories. Somewhere around 1965, although it wasn't new then.

Miriam Clark Potter, Mrs. Goose series.  The story "Hatbox Cake" is anthologized in Let's Hear a Story - 30 Stories and Poems for Today's Boys and Girls, ed. by Sidonie Matsner Grunberg, c. 1961.  The story is from one of Miriam Clark Potter's "Mrs. Goose" books, but I'm not sure which one.  Titles in the series include "Mrs. Goose of Animal Town" (1939), "Hello Mrs. Goose" (1947), "Here Comes Mrs. Goose" (1953), "Our Friend Mrs. Goose" (1956), "Mrs. Goose's Green Trailer" (1956), "Just Mrs. Goose" (1957), "Queer, Dear Mrs. Goose" (1959), "Goodness, Mrs. Goose!" (1960), "No, No, Mrs. Goose!" (1962), "Goofy Mrs. Goose" (1963), "Mrs. Goose and Three-Ducks" (1964), and "Mrs. Goose and her Funny Friends" (1964). "Hello Mrs. Goose" was reprinted in 2000, and "Just Mrs. Goose" was reprinted in 2004.
Miriam Clark Potter, Mrs. Goose, 1957, copyright.  This sounds like it could be a Mrs. Goose book. There are at least three of them: Just Mrs. Goose, Mrs. Goose and her Funny Friends and Goofy Mrs. Goose.
It's the only reference I could find to a 'hatbox cake' so maybe------Let's hear a story: 30 stories and poems for today's boys and girls / Sidonie Matsner Gruenberg / 1961 [1st ed.]. English  Book : Juvenile audience 160 p. illus. 29 cm. Garden City, N.Y., Doubleday.
Miriam Clark Potter, Our Friend Mrs. Goose, 1951, copyright.  This is in response to a question about where to find "The Hatbox Cake" story by Miriam Clark Potter.  The story, according to the acknowledgments in an anthology containing the story, was originally in Miriam Clark Potter's "Our Friend Mrs. Goose," published in 1951. The anthology referred to above is:  Let's Hear a Story, by Sidonie Matsner Gruenberg (1961).


U49: Unicorn, maiden, greyhounds
The book features a beautiful maiden, a white unicorn, and white greyhounds that hunt the unicorn. It is a children's book that contains mainly illustration, as opposed to text. The drawings are detailed, elegant, and realistic. I believe there may be a tapestry feel to the art and layout. My strongest image is that of the unicorn being attacked by the white greyhounds. I also recall the maiden having beautifully illustrated hands and fingernails. I encountered this book in the mid-eighties, and I have no idea what the title or author could have been.

Gale Cooper, Unicorn Moon, 1984, copyright.  "One night a lonely princess dreams of a handsome hunter on a unicorn, forever riding through the land of Unicorn Moon. His only companions are his hunting hounds. He is enchanted by a powerful spell - and can be freed only if she solves a great riddle: What is the meaning of true love?" Front cover shows a unicorn and two white greyhounds running, with a full moon behind them. The dogs are on either side of the unicorn, with open mouths and tongues hanging out, and could be construed as either attacking it or as simply running alongside and panting. There is an interior picture of a blonde prince, in lavendar tights & shirt, with a burgundy tunic, sitting at the edge of the water, with three white greyhounds sitting behind him and a full moon over his shoulder. He is reflected in the water, and the unicorn is standing in the foreground.

U50: Upside down world
Solved: The Silver Nutmeg

U51: Underground Society and Names
This book was found in a middle school library. It may have been a children's book, but then again, it may not have been as it contained some things I would consider very adult.  I am fuzzy on the plot of the book. Its been so many years; all I recall is a vague impression of the two main characters getting themselves into deeper and deeper trouble until they fled to a passageway above ground I'm not sure they believed existed.  I know the premise was that long ago a society had to go underground due to war or possibly environmental catastrophe, and believed they could never go back again, and that this was the world the main characters lived in. The entire book except the very end takes place underground.  One of the traits I do recall about the society was how they passed on names. If someone died, they would take the names of the person who died and give it to a newly born babe. So, say your father was named "Sam" and he died...the first male child to be born would then carry the name "Sam."  This became especially vivid when the main characters (a boy and a girl, not fully grown, I think) escaped to above ground up a long staircase (again, I think). They found a group of people who lived on the surface, and in the course of things one of the above-grounders died. One of the main characters asked who would take on his name, and the question earned them a lecture on honoring the dead.  Help?

This almost never happens to me, but as I was reading your stumper to post it, I suddenly had this thought that I might know what this is.  It reminded me of this movie trailer that I saw just yesterday (when I went to see Prince Caspian), called "City of Ember."  From the trailer, I gathered that there was this underground society, a refuge from Earth, meant to last 200 years; now the electricity generator is failing, and these 2 teens have to find the way out to save their society.  I did some online research and found that it's based on a young adult novel by Jeanne DuPrau also called The City of Ember, which is the first of the series Books of Ember.  I could be totally wrong, since these books are only a few years old and I don't know how long ago you found your book, but this just flashed into my mind, and I had to write this down. :)
City of Ember.  This also sounds like City of Ember to me, though I don't remember the part about the names being taken. There is also the Windsinger series, in which a brother and sister have to leave their town because they get into trouble.
The City of Ember is not the right book. The book I found was back when I was in middle school, and I'm 32 now. It was a lot of years back. However, there are some similarities, enough that I have wondered if the writer of "City of Ember" also read the same book.
Logan's Run.  
Okay, as I read the description again, there were a lot of similarities to the movie Logan's Run. I never read the book, but it could be what the reader is looking for--has the staircase and the upper/lower world with the belief that the world didn't exist anymore.

Gregory Maguire, I Feel Like the Morning Star, 1989, copyright. I haven't read this, and nothing mentions the names, but the book sounds right in other ways. There's a post-nuclear underground society, rigid, static, and frightened, which is shaken up by three teenagers who are determined to be free.
Louise Lawrence, Andra. I remember the book Andra having an underground society with a strange way of choosing names.  But the rest of the details don't fit, and Andra had quite a downbeat ending that i thought would be mentioned in the query.  So it's not a strong possibility.
I remember this one!  The city underground is cramped and dirty and overcrowded.  The girl and boy decide (there is some overwhelming reason) to just keep going up the staircase until they find out where it ends.  I remember one level, the girl has to go to the restroom and pretends she has to vomit to move up the line of women waiting quickly. It was definitely published in the mid to 1980's.  I will try to jar my memory some more about this book.

U52: Underground girl
I think that this was a serial in Jack and Jill magazine in the 1950's.  A girl lives both on top of and under the ground.  This seems to be in tunnels and perhaps in Ireland.  I don't remember any time traveling taking place but just that she goes underground when there is trouble on top.  Thank you.

U53: Unicorn kept on apartment roof
The Secret Unicorn (maybe?), 1975.  This is a children's novel about a girl who lives in the city (I believe it was NYC, but it may have been Chicago or another big US city) who secretly owns a unicorn and keeps it on the roof of her family's apartment building. Eventually the unicorn becomes unhappy living there and the girl has to let it free -- a very sad, but sweet ending.  I remember it having a light blue cover with a whimsical illustration of a unicorn, possibly with a girl riding it. I think the type may have been orange. I think I may have ordered the paperback from a school book fair.

Georgess McHargue, Stoneflight,
1975, copyright.  Any chance it was a griffin, instead of a unicorn? Set in Manhattan in the 1970s, Stoneflight is about a pre-teen girl (Janie) who escapes her parents marital problems by hiding out on the rooftop of her apartment building.  There, she spends her time cleaning a beautiful stone griffin (whom she calls "Griff") until he finally comes to life for her and she is able to soar over the city on his back. Janie then travels around New York City, discovering other stone animals decorating the City’s architecture and bringing them to life.  However, when the animals start to turn her into stone, she learns that having feelings is the price of remaining human. Front cover shows Janie riding on the back of the griffin. Dominant colors are blues, greens, and lavender.