The Sesame Street Treasury Volume 15

The Sesame Street Treasury Volume 15 starring the number 15 and the letters X, Y and Z.
===Stories included===
* Name That Fifteen! - Guy Smiley, Grover, Ernie, Bert, Prairie Dawn, Betty Lou and Cookie Monster(artist: Tom Cooke)
* The Great Sesame Street Alphabet Show - Big Bird, Oscar, Slimey (incorrectly colored), Herry, Grover, Cookie Monster, Bert, The Amazing Mumford, Herbert Birdsfoot (artist: Michael Frith)
* Profile: The Two-Headed Monster (artist: Mary Grace Eubank) 
* Ankle, Shoulder, Knee - a poem by Big Bird, with Maria, David and Bob (artist: A. Delaney)
* Ernie Buys a Z - The Salesman, Ernie, Bert, Roosevelt Franklin, Oscar, Herry, Prairie Dawn and Guy Smiley (artist: Joe Mathieu)
* Two-page photo spread: Grover, Big Bird and Little Bird with measuring tape (photographer: Charles Rowan)
* xX/yY - Bert and Cookie Monster (artist: Marc Nadel)
* Say it in Spanish! People in My Neighborhood - Betty Lou, Ernie, Telly, Big Bird, Grover, Biff, Sully, Prairie Dawn and Cookie Monster(artist: Maggie Swanson) 
* The Count's Counting Page - 15 steps (artist: Larry DiFiori)
* Photo: Bert's yo-yo
* Say it in Sign Language! - Linda, the alphabet and numbers (artist: Tom Cooke; photographs by Neil Selkirk)
* Two-page photo spread - Cookie Monster in a messy kitchen
* Sherlock Hemlock in The Mystery of the Missing Alphabet (artist: Mel Crawford)
* Cookie Monster's Alphabet Cookies recipe (artist: Michael Frith)
* Grover and the Twenty-Six Scoops (artist: Marc Nadel)
* Can you find 15 Twiddlebugs? (artist: Marc Nadel)
* Mary Had a Little Lamb (artist: Randy Jones)
* Which Yo-Yo? - Ernie (artist: Mary Grace Eubank)
* 1, 2 Green and Blue!
* Bookend: Big Bird and Oscar
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