Subject Region
Pennsylvania
194
United States
127
New York (State)
97
Alaska
79
British Columbia
71
Earth (Planet)
61
California
59
North America
59
Argentina
57
Virginia
49
Colorado
47
Ontario
47
Québec (Province)
43
Canada
35
Mexico
35
Utah
35
Nevada
32
Alberta
29
Arizona
29
Wyoming
29
West (U.S.)
27
Great Britain
26
Maryland
26
Montana
26
Antarctica
25
South America
24
Texas
23
Spain
22
Yukon
22
China
20
New Mexico
20
Nova Scotia
20
Europe
19
New Jersey
18
Washington (State)
18
Manitoba
16
Northwest Territories
16
Idaho
15
Minnesota
15
England
14
Espana
14
Newfoundland and Labrador
14
Saskatchewan
14
Caribbean Area
13
Mars (Planet)
13
Sierra Nevada (Calif. and Nev.)
13
Appalachian Mountains
12
Australia
12
Mexico, Gulf of
12
Oregon
12
more ...