Region
- Africa 7 results
- Afrique du Sud 2 results
- America 4 results
- Brazil 2 results
- Developing countries 6 results
- El Salvador 2 results
- Eurasia 2 results
- Europe 6 results
- Great Britain 8 results
- Hanford Site (Wash.) 2 results
- Hawaii 2 results
- Illinois 2 results
- Malawi 2 results
- New York (State) 2 results
- Oregon 2 results
- Poland 2 results
- South Africa 2 results
- Syracuse 2 results
- United States 48 results
- Washington (State) 2 results