Geography
United States
14 results
Soviet Union
3 results
Texas
2 results
West (U.S.)
2 results
Andes
1 results
Argentina
1 results
Bolivia
1 results
Canada
1 results
Carlsbad Caverns (N.M.)
1 results
Germany
1 results
Korea
1 results
Montana
1 results
New York (State)
1 results
North Carolina
1 results
Ontario
1 results
Peru
1 results
Québec (Province)
1 results
Rio Grande Valley (Colo.-Mexico and Tex.)
1 results
South Park (Colo.)
1 results
Southeast Asia
1 results
Venezuela
1 results
Wyoming
1 results