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Mexico, Chiapas, Mt. Madre Vieja

Colorado, 4 mi N.W. Buckingham

Mexico, Baja California, 9 mi. northwest El Arco

Mexico, Baja California Sur, 10 miles W San Ignacio

Mexico, Baja California, 20 mi. northwest El Arco

Mexico, Baja California, 61 miles north of Punta Prieta

Mexico, Baja California Sur, 3 miles E of El Anco

Arizona, 7 mi W Fort Huachuca

Arizona, 7 mi SE Patagonia

Arizona, 4 mi W, 5 mi S Lhinicahua National Monument

Arizona, 13 mi W Willcox

Utah, 10 miles S of junction highways US 6 & Utah 128, Colorado River

Canada, Manitoba, 2.5 miles E of Carberry on old highway 1, 1850'

Wyoming, Laramie, laboratory crosses of GrandForks North Dakota X ( adults)

Mexico, Veracruz, Veracruz, 2.6 miles S of Huatusco

Mexico, Veracruz, Veracruz, 31 miles S of Tierra Colorado

Mexico, Michoacán, Michoacan, 4 miles W of Mexico-Michoacan border, (8 miles E of Zitacuaro)

Mexico, Veracruz, Veracruz, 2.9 miles S of Huatusco

Mexico, Sonora, 5 miles N Vicam

Mexico, Hidalgo, El Chico National Parque

Mexico, Sinaloa, 21 miles E of Villa Union

Mexico, Sinaloa, 18 miles E of Villa Union

California, Tecolate Canyon (5.5 miles N of Downtown San Diego)

Mexico, Nuevo Leon, 1.5 mi. south of Villa de Garcia

Colorado, Glenwood Springs

Mexico, Chihuahua, 31 km N of Ahumada, Mexico Highway 45

Mexico, Chihuahua, 13.2 miles S of Ld. Delicias

Mexico, Chihuahua, 7 miles S of Jimenez, Hwy 49

Mexico, Chihuahua, 8.6 miles S of Montezuma

Colorado, 6 miles south of Rangeley, on Douglas Pass Road

Mexico, Chihuahua, 43 kilometers north of Ahumada, Mexivan Highway 45

Arizona, Idlewild Campground, 2 mi W Portal

New Mexico, 7.1 miles W of Animas, State Highway 9

New Mexico, 13 miles W of Animas, State Highway 9

Colorado, 8 miles north of Rifle on Highway 13

Colorado, 3 miles southeast of Glenwood Springs, Lookout Mountain Road

New Mexico, 8 miles west of Tularosa, Tularosa Gate to missile base

Texas, 7 miles S of College Station

Missouri, Beaver Creek, 6 miles S of Rolla

Mexico, Sonora, 13.5 km W Caborca

Arizona, 3 miles ESE Wilcox

Colorado, 3.5 miles S of Kersey

Mexico, Sonora, 9 km E Mazocahui, 3000 ft. elevation

Colorado, 2 miles E of Roggen

Colorado, Palisade water shed

Colorado, T7n, R68W, s17, NE quarter

Mexico, San Luis Potosi, Micos, 32 km NW of Ciudad Valles

Colorado, 1 mille E of Ft. Collins, T7N, R68W, s17; NE quarter, 5100'

Colorado, 1 mile E of Ft. Collins, T7N, R68W, s17; NE quarter

Colorado, Lyons Rock Quarry