Robert Harding

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832-317729 - USA, United States of America, Arizona: Biosphere 2 Ceter of the Columbia University. From 1991 to 1993 3 people tried to live in this artificial world without support from the outside world. Today it is a tourist attraction and conferece center.
832-317730 - USA, United States of America, Arizona: Biosphere 2 Ceter of the Columbia University. From 1991 to 1993 3 people tried to live in this artificial world without support from the outside world. Today it is a tourist attraction and conferece center.
801-1095 - Casa Grande (Great House) Ruins National Monument, home to the Sonora Desert people, founded near 400 AD, abandoned about 1450 AD, Coolidge, Arizona, United States of America, North America
801-1094 - Casa Grande (Great House) Ruins National Monument, home to the Sonora Desert people, founded near 400 AD, abandoned about 1450 AD, Coolidge, Arizona, United States of America, North America
979-3693 - Aerial view of Isla San Esteban (foreground) and Isla Tiburon - the largest island in the Gulf of California (Sea of Cortez), Sonora, Mexico taken from a commercial flight.
698-2803 - Sonora Pass, 9624 ft, on State Route 108, the second highest highway over the Sierras, Sierra Nevada mountains, California, United States of America, North America
764-2621 - Hypomelanistic Western diamond-back rattlesnake (Western diamondback rattlesnake) (Crotalus atrox) in captivity, Arizona Sonora Desert Museum, Tucson, Arizona, United States of America, North America
764-2620 - Mojave rattlesnake (Mohave Rattlesnake) (Mojave Diamond Rattlesnake) (Desert Diamond Back) (Crotalus scutulatus) in captivity, Arizona Sonora Desert Museum, Tucson, Arizona, United States of America, North America
764-2231 - Sonoran Desert sidewinder (Sonoran sidewinder) (Crotalus cerastes cercobombus) in captivity, Arizona Sonora Desert Museum, Tucson, Arizona, United States of America, North America
764-2230 - Western diamond-back rattlesnake (Western diamondback Rattlesnake) (Crotalus atrox) in captivity, Arizona Sonora Desert Museum, Tucson, Arizona, United States of America, North America