3

Sacagawea

4

Maddy's Delaware Diary

2

At the Farm

4

Maddy's North Carolina Diary

3

Wetlands of the World

4

Niagara Falls

2

Treeless Plains! Steppe

2

Giddy Up, Cowgirls!

3

Magnetism

4

The Plains Indians People

3

Confucius

3

Nathan the Whale

2

Prince Troy's Voyage