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| Written by | Michael Frith, Emily Perl Kingsley, David Korr, Sharon Lerner, Nina B. Link, Jeffrey Moss, Norman Stiles, Daniel Wilcox |
| Illustrator | Mel Crawford, Peter Cross, A. Delaney, Michael Frith, Joseph Mathieu, Jon McIntosh, Michael J. Smollin, Caroll Spinney |
| Published | 1978 |
| Publisher | Funk & Wagnalls |
| Series | The Sesame Street Library |
| ISBN | 0834300206 |
The Sesame Street Library Volume 12 featuring the letters W, X, Y and Z and the number 12
Stories included
- Once Upon an Eleven - featuring Big Bird and Olivia (Betty Lou)
- Ernie Presents the Letter U (with Cookie Monster)
- The King's Nose - Mumford, Ernie and Bert
- Susan's Body Parts Puzzle (with Gordon and Big Bird)
- Thumbelina
- Sherlock Hemlock in The Case of the Missing Caterpillar or The Clue of the Cracked Cocoon (with Grover)
- Bert and Ernie Build a Snowman
- A Day at the Beach - Photos by ERNIE!
- Jack and Jill - Bert and Ernie
- Grover Gets Under Things (with Herbert Birdsfoot)
- Cookie Monster's Big and Little Cookies
- The Shoemaker and the Elves - Bert and the Twiddlebugs
- Two page photo: Sesame Street Monsters
- The Story of Princess Ruby
- The Amazing Mumford's Vanishing Trick
- Roosevelt Franklin: Hot and Cold
- The People In Your Neighborhood - Bob and the Anything Muppets (plumber, dentist, barber)
- My Favorite Shape by Big Bird
- A Bird's Tale - Big Bird and Little Bird
- Bookend - Ernie and Bert