Subject Region
United States
680
Mexico
147
China
105
European Union countries
70
Canada
66
Europe
53
Developing countries
48
India
30
Europe, Eastern
28
West (U.S.)
27
California
26
Japan
25
Australia
23
Latin America
23
North America
23
Great Britain
21
Africa
19
Asia
19
Brazil
18
Europe, Central
17
Germany
16
Russia (Federation)
15
Ecuador
12
Colombia
10
Soviet Union
10
Yellowstone National Park
10
Pacific Area
9
Scandinavia
9
British Columbia
8
Florida
8
Northwest, Pacific
8
Former Soviet republics
7
Malaysia
7
New Jersey
7
New Mexico
7
New York (State)
7
Southern States
7
Amazon River Region
6
Appalachian Region
6
Arctic regions
6
Asia, Central
6
Caribbean Area
6
Clayoquot Sound Region
6
Israel
6
Ontario
6
Spain
6
Tanzania
6
Africa, Sub-Saharan
5
America Latina
5
East Asia
5
more ...