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