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For this instructional web site, let us begin by looking at the following images:
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Map showing an approximation of the U.S. Southwest, including northwest Mexico
Map showing the biotic diversity in the U. S. Southwest and Northwest Mexico (courtesy of the Arizona-Sonora Desert Museum)
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Detailed map of the U. S. Southwest and northwestern Mexico, © 1986, Arizona Board of Regents
Suggested reading:
Arizona-Sonora Desert Museum. A Natural History of the Sonoran Desert, Tucson: Arizona-Sonora Desert Museum Press; Berkeley; London: University of California Press, © 2000. SABIO RECORD