Deserts of the southwestern United States, for the Death Valley regional ground-water flow system study, Nevada and California
This digital data set defines the boundaries of the deserts of the southwestern United States.  
Those deserts include the Great Basin, Mojave, Colorado, and Sonoran Deserts as defined 
by Benson and Darrow (1981).  The study by Benson and Darrow (1981) was a historical 
reference used to support development of the …