Region
Venezuela
243
Investigación
157
Cuba
149
Perú
60
Colombia
28
Spain
25
United States
24
Mexico
19
España
17
China
16
Argentina
12
Chile
12
México
9
Brazil
8
Poland
8
Australia
7
Canada
7
Tropics
7
Earth (Planet)
6
États-Unis
6
India
6
Latin America
6
Romania
6
Soviet Union
5
Czech Republic
4
Publicación periódica
4
South America
4
Australie
3
Croatia
3
Europe
3
Japan
3
Korea (South)
3
New Zealand
3
Pakistan
3
Russia (Federation)
3
Slovenia
3
Turkey
3
Arctic regions
2
CHILE
2
California
2
Canada, Western
2
Celle
2
Central America
2
Czechoslovakia
2
Indonesia
2
Italy
2
Lithuania
2
Malaysia
2
Mediterranean Region
2
New York (State)
2
mer ...