1910. Geological Survey (U.S.). Relief shown by hachures.; Printed by A. Hoen & Co., Baltimore. 32 x 51 Centimeters Scale 1:62,500 General Map Collection. The Survey (Washington, D.C).
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1910. Geological Survey (U.S.) and Wilson, A. D. (W 106⁰19ʹ--W 106⁰13ʹ/N 39⁰16ʹ--N 39⁰13ʹ). Relief shown by contours and spot heights. "Surveyed in 1879. Railroads and some shafts added later.... The Survey (Washington, D.C).