4

U.S.S. Arizona Memorial at Pearl Harbor

4

Maddy's Arizona Diary

4

Hoover Dam

4

Maddy's Utah Diary

2

Map of the United States of America

4

Grand Canyon

3

Harbors of the World

4

Maddy's New Mexico Diary

4

Maddy's Nevada Diary

3

Canyons of the World

3

Meteorites, Meteoroids, and Meteors