4

Maddy's Louisiana Diary

3

Sinkholes of the World

4

Maddy's South Dakota Diary

4

Tornadoes

4

Maddy's Kansas Diary

4

Mount Rushmore

4

Maddy's Mississippi Diary

4

Maddy's Arkansas Diary

3

Gulfs of the World

4

Famous Americans: Thomas Jefferson

4

From the American Revolution to the Civil War

4

Maddy's New Mexico Diary

4

Maddy's Texas Diary

4

The Mississippi River

4

Maddy's Montana Diary

3

Sacagawea

4

Maddy's Minnesota Diary

4

An Introduction to the History of the United States of America

4

Maddy's Missouri Diary

2

Map of the United States of America

4

Maddy's Oklahoma Diary

4

Maddy's Iowa Diary

3

Coastal Plains of the World