Region
- United States 134 results
- Great Britain 13 results
- Canada 9 results
- Colombia 9 results
- Chile 4 results
- Colorado 3 results
- Mexico 3 results
- Australia 2 results
- Brazil 2 results
- Developing countries 2 results
- England 2 results
- European Economic Community countries 2 results
- Germany 2 results
- India 2 results
- Latin America 2 results
- Mozambique 2 results
- New York (State) 2 results
- North America 2 results
- South Africa 2 results
- Syracuse 2 results
- Tanzania 2 results
- West (U.S.) 2 results
- West Point, New York 2 results
- Zanzibar 2 results
- Arab countries 1 results
- Argonne 1 results
- Bulgaria 1 results
- China 1 results
- England, South East 1 results
- Europe 1 results
- Illinois 1 results
- Indonesia 1 results
- Italy 1 results
- Maryland 1 results
- Netherlands 1 results
- Oak Ridge 1 results
- Scandinavia 1 results
- Southern States 1 results
- Soviet Union 1 results
- Spain 1 results
- Tennessee 1 results
- Valencia 1 results