Geography
United States
12 results
Developing countries
2 results
England
2 results
Philippines
2 results
Belgium
1 results
Czechoslovakia
1 results
France
1 results
Indonesia
1 results
Kentucky
1 results
Memphis
1 results
Memphis (Tenn.)
1 results
Mexico
1 results
Ontario
1 results
Soviet Union
1 results
Sudbury
1 results
Tennessee
1 results
Turkey
1 results