Region
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Chihuahua (State)
30
Ciudad Juárez
30
Cuba
30
France
30
Argentina
29
Caribbean Area
28
New Spain
28
Utah
27
Grand Canyon (Ariz.)
26
Mexico, Valley of
26
Black Kettle National Grassland (Okla. and Tex.)
25
Chihuahua (Mexico : State)
25
Florida
25
Louisiana
25
Mexique
25
Rita Blanca National Grassland (Okla. and Tex.)
25
Colorado River Valley (Colo.-Mexico)
24
Jalisco (Mexico)
24
Ciudad Juárez (Mexico)
23
Santa Fe (N.M.)
23
Veracruz-Llave (State)
23
California, Gulf of
22
Chile
22
Michoacán de Ocampo (Mexico)
22
South America
22
Yucatán Peninsula
22
Colorado River
21
Kiowa National Grassland
21
McClellan Creek National Grassland
21
México
21
Southwestern States
21
Teotihuacán Site (San Juan Teotihuacán, Mexico)
21
Venezuela
21
Great Britain
20
Los Angeles
20
Puebla (State)
20
Rio Grande Valley (Colo.-Mexico and Tex.)
20
Guadalajara (Mexico)
19
Gulf Coast (U.S.)
19
Hoover Dam (Ariz. and Nev.)
19
Nevada
19
Chaco Canyon
18
Chaco Canyon (N.M.)
18
China
18
Guadalajara
18
Los Alamos
18
Mexico, Valley of (Mexico)
18
Taos
18
West Indies
18
Yucatán (State)
17
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