"Base map from U.S. Geological Survey state map." "Data corrected to May 1, 1940.", Imprint: [Washington, D.C.?] : The Administration, [1940], Scale: 1:500,000; Dimensions: 92 x 70 cm, sheets 55 x 79 cm, Coordinates: W0880700 W0844500 N0414500 N0375200
United States. Public Roads Administration (1940). Federal aid highway system progress map. United States. Public Roads Administration. https://purl.dlib.indiana.edu/iudl/images/VAC3073/VAC3073-M-00588 (map)