200602 Northern Red Oak (Quercus rubra) - USGS Forest Service Native Range 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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 - USGS Forest Service Native Range Map.jpg "200602 Northern Red Oak (Quercus rubra) - USGS Forest Service Native Range Map.jpg")