- $9.92Leaf-Cutting Ants by Helen FrostBetter World Books
- $7.72The Fruit Group by Helen FrostBetter World Books
- $9.89Fog by Helen FrostBetter World Books
- $12.50Arctic Hares by Helen FrostBetter World Books
- $9.52Bird Families by Helen FrostBetter World Books
- $10.86Monarch Butterflies by Helen FrostBetter World Books
- $7.23Butterfly Eggs by Helen FrostBetter World Books
- $9.00Drinking Water by Helen FrostBetter World Books
- $8.41Jaguars by Helen FrostBetter World Books
- $16.82Tiranosaurio Rex/Tyrannosaurus Rex by Helen FrostBetter World Books
- $9.11Water as a Gas by Helen FrostBetter World Books
- $14.52El Agua Como un Liquido by Helen FrostBetter World Books