Distribution map for Abies amabilis (Douglas ex Loudon) Douglas ex Forbes - Pacific silver fir
Elbert L. Little, Jr., U.S. Department of Agriculture, Forest Service, and others
1971
<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>