Region
Europe --
11
Africa --
2
United States --
2
20th Century
1
East Asia --
1
Former Soviet republics
1
Former Soviet republics --
1
Korea (North) --
1
Korea (South) --
1
Large, David Clay
1
Middle East --
1
New York
1
New York (State) --
1
Pacific Area --
1
Southeast Asia --
1
Soviet Union --
1
United States
1