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For this instructional web site, let us begin by looking at the following images:

map showing an approximation of the US southwest and northwest Mexico [17K]      
map showing biotic diversity of the US southwest and northern Mexico [66K]

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)

Map detailing the region [34K]

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