Region
United States
12
North America
5
Southwest, New
4
Northwest Coast of North America
3
California
2
Great Britain
2
New England
2
Arctic regions
1
Asia
1
Canada
1
Central America
1
Central Highlands
1
Central Highlands (Vietnam)
1
Chaco Canyon
1
Chaco Canyon (N.M.)
1
China
1
Colorado
1
Columbia Plateau
1
Connecticut River Valley
1
Great Plains
1
Hayes County
1
Hayes County (Neb.)
1
Herculaneum (Extinct city)
1
Idaho
1
Italy
1
Japan
1
Los Angeles
1
Los Angeles (Calif.)
1
Ludlow
1
Ludlow (Colo.)
1
Mexico
1
Middle Atlantic States
1
Middle West
1
Nebraska
1
New Mexico
1
Northeastern States
1
Pompeii (Extinct city)
1
Pueblo Bonito Site
1
Pueblo Bonito Site (N.M.)
1
Southern States
1
Vietnam
1
West (U.S.)
1