Region
Adriatic Sea Region
1
Africa
2
Africa, North
1
Asia
3
Assyria
1
Canada, Western
1
Chesapeake Bay Watershed
1
China
4
Colombia
1
Communist countries
1
Developing countries
6
East Asia
3
Europe
7
Europe, Central
2
Europe, Eastern
3
European Economic Community countries
1
Former Soviet republics
2
Germany
1
Germany (West)
1
Great Britain
3
Hawaii
1
India
9
Japan
4
Mexico
1
Middle East
2
Ohio
1
Pacific Area
1
Persian Gulf Region
1
Québec (Province)
1
Russia (Federation)
1
Technological innovations
1
United States
86