1911. Geological Survey (U.S.). Shows drainage, state boundaries and principal cities. 43 x 71 centimeters Scale 1:7,000,000 General Map Collection. U.S. Geological Survey (Washington, D.C).
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1911. Leith, C. K. (Charles Kenneth), 1875-1956. Relief shown by contours.; "Corrected to January 1, 1911."; "Monograph LII, plate VIII"--Upper right corner. 37 x 271 centimeters Scale 1:62,500 Ge... U.S. Geological Survey (Washington, D.C).