Subject Region
United States
732
New York (State)
35
California
14
Washington (State)
8
Pennsylvania
6
Texas
6
Virginia
6
Michigan
5
Canada
4
Connecticut
4
Louisiana
3
Maryland
3
Massachusetts
3
Missouri
3
Arizona
2
Indiana
2
Minnesota
2
New Jersey
2
North Carolina
2
Washington (D.C.)
2
Appalachian Region
1
Baltic States
1
China
1
Colorado
1
Europe
1
Europe, Eastern
1
European Economic Community countries
1
Florida
1
Former Soviet republics
1
France
1
Illinois
1
Kansas
1
Kentucky
1
Lithuania
1
Mexico
1
New York
1
Oklahoma
1
Pacific Area
1
Poland
1
Russia (Federation)
1
South Carolina
1
Southern States
1
Tennessee
1
West (U.S.)
1
Wisconsin
1