While they weren't quite as popular as that book, Here are some others the children always enjoyed:
The Very Hungry Caterpillar by Eric Carle,
Noisy Nora, and Morris's Disappearing Bag by Rosemary Wells,
The Snowy Day by Ezra Jack Keats,
and Caps For Sale by Esphyr Slobodkina.
Books about the Berenstain Bears or written by Dr. Seuss were also always popular.
What do you think these books had in common that made them become classics, loved by generations of children?