Region
Aids and devices
1
Babylonia
2
Canada
1
China
1
England
2
Gettysburg National Military Park (Pa.)
1
Great Britain
5
Greece
1
India
1
Iraq
2
Jimmy Carter National Historic Site (Plains, Ga.)
1
New York
1
New York (State)
1
Pennsylvania
1
Philadelphia
1
Rome
1
Russia
1
Soviet Union
2
Tennessee
2
United States
57
West (U.S.)
2
Wounded Knee (S.D.)
1
Wounded Knee Memorial and Historic Site (S.D.)
1