Region
Alabama
1
Arkansas
1
Asia
4
Astronautics
1
Atomic bomb
1
Austria
2
California
2
Chicago
1
Chicago (Ill.)
1
Confederate States of America
1
Cuba
2
Europe
3
Great Britain
3
Hawaii
1
Illinois
1
Japan
2
Latin America
1
Little Rock
1
Montgomery
1
New York
4
New York (N.Y.)
1
New York (State)
4
Oak Ridge
2
Oak Ridge (Tenn.)
2
Oceania
2
Southern States
3
Soviet Union
5
Tennessee
2
USA
1
United States
417
Vienna
2
West (U.S.)
2
États-Unis
3