Natural distribution map for <i><b><a href="//commons.wikimedia.org/wiki/Acer_macrophyllum" title="Acer macrophyllum">Acer macrophyllum</a></b></i>.
Elbert L. Little, Jr., USGS
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>