Subject Region
United States
94
Japan
11
Developing countries
7
Canada
6
Russia (Federation)
6
Europe
5
China
4
Netherlands
4
Norway
4
Asia
3
Great Britain
3
Antarctica
2
Developed countries
2
European Economic Community countries
2
European Union countries
2
Germany
2
Germany (East)
2
Israel
2
McMurdo Station (Antarctica)
2
Binhai Xinqu (Tianjin, China)
1
Europe, Eastern
1
France
1
India
1
Korea (South)
1
Persian Gulf Region
1
Singapore
1
Soviet Union
1
Tianjin
1
Tianjin Jingji Jishu Kaifaqu (Tianjin, China)
1