Region
United States
287
Japan
7
China
6
District of Columbia
5
Latin America
5
Africa
3
Canada
3
Caribbean Area
2
Europe, Eastern
2
Maryland
2
Mexico
2
North America
2
South America
2
Turkey
2
America
1
Australia
1
Beltsville
1
Europe
1
Europe, Central
1
European Economic Community countries
1
États-Unis
1
Great Plains
1
Korea
1
New Zealand
1
North Pacific Ocean
1
Pacific Coast
1
Soviet Union
1
Taiwan
1
Washington (D.C.)
1