Subject Region
Earth
20
Earth (Planet)
7
China
5
Italy
3
Middle East
3
America
2
British Columbia
2
Egypt
2
Great Britain
2
Guatemala
2
Iraq
2
Latin America
2
Orinoco River Valley (Venezuela and Colombia)
2
United States
2
Universe
2
Africa
1
Arkansas
1
Australia
1
Canada
1
Chaco Canyon (N.M.)
1
Chamula
1
Europe
1
Fajada Butte (N.M.)
1
Gaza
1
Mexico
1
Modena
1
North America
1
Puerto Rico
1
Solar system
1
Southwest, New
1