Region
West (U.S.)
United States
70
California
25
Columbia River
16
Missouri River
16
Rocky Mountains
14
Oregon National Historic Trail
13
United States, West
11
Pacific States
10
New Mexico
8
Yellowstone National Park
7
Canada
6
Mexico
6
Mississippi River Valley
6
Southwest, New
6
West (U. S.)
6
Great Plains
5
Mississippi River
5
Utah
5
England
4
Hawaii
4
Northwest, Canadian
4
Northwestern States
4
Nottinghamshire
4
Spain
4
Wyoming
4
California National Historic Trail
3
Colorado River (Colo.-Mexico)
3
Montana
3
Nevada
3
New York
3
New York (State)
3
North America
3
Northwest, Pacific
3
Nottinghamshire (England)
3
Oregon
3
Central America
2
Chihuahua (Mexico : State)
2
Colorado
2
Europe
2
Idaho
2
Iowa
2
Minnesota
2
Missouri River Valley
2
Ohio River
2
Pacific Coast (U.S.)
2
Rocky Mountains Region
2
Santa Fe National Historic Trail
2
Sonoran Desert
2
Southern States
2
more ...