Region
United States
162
Great Britain
6
Australia
5
China
4
Solar system
4
Africa
3
Canada
3
Europe
3
Greece
3
Japan
3
Mexico
3
North America
3
Rome
3
Tennessee
3
Asia
2
India
2
Russia
2
Soviet Union
2
West (U.S.)
2
Antarctica
1
Central America
1
Earth (Planet)
1
Egypt
1
England
1
France
1
Gettysburg National Military Park (Pa.)
1
Iraq
1
Israel
1
Kenya
1
Mars (Planet)
1
Michigan
1
Netherlands
1
Nigeria
1
Poland
1
South America
1
Study and teaching (Elementary)
1
Wounded Knee (S.D.)
1
Wounded Knee Memorial and Historic Site (S.D.)
1
États-Unis
1