"The Sesame Street Treasury Vol. 9: Starring the Number 9 & the Letters M, N, & O" is a vintage picture book from 1983, part of the Sesame Street book series published by Random House. The book features the characters of the Number 9 and the letters M, N, and O, making it perfect for young audiences who are learning the ABCs and numbers. With illustrated by Mary Grace Eubank, Tom Cooke, Michael Firth, Joe Mathieu, and Michael J. Smollin, this book is sure to entertain children with its bedtime stories and nursery rhymes. The authors, including Norman Stiles, Linda Bove, and Dan Wilcox, crafted a fun and educational narrative that is a must-have for fans of the beloved Sesame Street characters."