Natural distribution map for <i><b><a href="//commons.wikimedia.org/wiki/Category:Arctostaphylos_pringlei" title="Category:Arctostaphylos pringlei">Arctostaphylos pringlei</a></b></i> in the Southwestern United States.
Elbert L. Little, Jr., of the U.S. Department of Agriculture, Forest Service, and others
1976
<a rel="nofollow" class="external text" href="https://esp.cr.usgs.gov/data/little/">USGS Geosciences and Environmental Change Science Center: Digital Representations of Tree Species Range Maps from "Atlas of United States Trees" by Elbert L. Little, Jr. (and other publications)</a>