First Encyclopedia of Seas and Oceans: 1 (First Encyclopedias)

First Encyclopedia of History: An Introduction to History from Dinosaurs to the Civil Rights Movement, for Kids (Ages 5-8)

First Encyclopedia of Dinosaurs: An Introduction to Prehistoric Animals, the Ice Age, and Extinctions, for Kids (Ages 5-8)

First Encyclopedia of Seas & Oceans

First Encyclopedia of Science

First Encyclopedia of Our World