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- The little engine that could, by Watty Piper ; adapted by Walter Retan
- The little engine that could, by Watty Piper ; adapted by Walter Retan
- Bunnies, bunnies, bunnies, a treasury of stories, songs, and poems, compiled by Walter Retan ; illustrated by Carolyn Ewing and other illustrators
- La facil de leer pequena locomotora que si pudo, Por Watty Piper, adaptado para pequenos lectores por Walter Retan, ilustrado por Mateu, traducido por Alma Flor Ada
- The little engine that could, by Watty Piper ; adapted for young readers by Walter Retan ; illustrated by Mateu
- The busy, busy world of Richard Scarry, Walter Retan, Ole Risom
- Favorite tales from many lands, retold by Walter Retan ; illustrated by Linda Medley
- Armies of ants, by Walter Retan ; illustrated by Jean Cassels
- The big book of real trucks, by Walter Retan ; illustrated by Richard Courtney
- The story of Davy Crockett, frontier hero, by Walter Retan ; illustrated by Steven James Petruccio
- The easy-to-read little engine that could, by Watty Piper ; adapted for young readers by Walter Retan ; illustrated by Mateu