200806 Black Walnut Tree (Juglans nigra) - USGS North America Distribution Map
Digital maps of the ranges of tree species in North America compiled by Elbert Little and others
U.S. Department of the Interior
U.S. Geological Survey
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%20-%20USGS%20NA%20Distribution%20Map.jpg "200806 Black Walnut Tree (Juglans nigra) - USGS NA Distribution Map.jpg")