Region
Alabama
1
America
3
Arab countries
3
Arkansas
1
Asia
4
Astronautics
1
Atomic bomb
1
Austria
3
California
2
Chicago
1
Chicago (Ill.)
1
Confederate States of America
3
Cuba
2
England
1
Europe
3
Foreign countries
2
Great Britain
12
Hawaii
1
Illinois
1
Islands of the Pacific
1
Japan
2
Latin America
1
Little Rock
1
Los Angeles (Calif.)
2
Lowell
2
Massachusetts
2
Montgomery
1
New York
4
New York (N.Y.)
1
New York (State)
4
Niagara Falls (N.Y. and Ont.)
2
Northeastern States
3
Oak Ridge
2
Oak Ridge (Tenn.)
2
Oceania
2
Ozark Mountains
1
Southern States
8
Soviet Union
5
Tennessee
2
USA
1
United States
638
Vienna
2
West (U.S.)
3
États-Unis
4