Region
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Colorado
35
Columbia (Ky.)
1
Columbia Plateau
2
Columbus
1
Columbus (Ohio)
1
Communist countries
2
Community life
1
Confederate States of America
28
Confederated Tribes of Siletz Indians of Oregon
1
Congo (Democratic Republic)
3
Connecticut
6
Corredor Vial Interoceánico Sur
1
Costa Rica
2
Council Bluffs
1
Council Bluffs (Iowa)
2
Council Bluffs Region
1
Cowboy Recreation and Nature Trail
1
Cowboy Recreation and Nature Trail (Neb.)
1
Córdoba (Veracruz-Llave)
1
Córdoba (Veracruz-Llave, Mexico)
1
Crawford Region
1
Crescent Lake National Wildlife Refuge
2
Crescent Lake National Wildlife Refuge (Neb.)
3
Crimes against
1
Cripple Creek
2
Cripple Creek (Colo.)
2
Crown Ranch (Okla.)
1
Cuba
10
Curaray River Valley (Ecuador and Peru)
1
Current River Region (Mo. and Ark.)
1
Cut Bank
2
Cut Bank Region
2
Cut Bank Region (Mont.)
2
Cuyahoga Valley National Park
3
Cuyahoga Valley National Park (Ohio)
4
Czech Republic
4
Czech republic
1
Czechoslovakia
2
Côte d'Ivoire
1
Dakota
1
Dakota Formation
2
Dances with Grasshoppers Site
1
Dances with Grasshoppers Site (Mo.)
1
Dawes County
1
De Soto National Wildlife Refuge (Neb. and Iowa)
1
Deadwood
2
Deadwood (S.D.)
2
Dearborn
2
Delaware
3
Denali National Park and Preserve
1
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