1921. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1916 and 1919.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heig... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1921. Geological Survey (U.S.). Decorative vine border.; Map numbered 79.; Map detached from atlas.; Text on verso. 44 x 71 centimeters Scale 1:7,000,000 General Map Collection. The Survey (Washington, D.C).
1921. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1914, 1916 and 1920.";"Surveyed in cooperation with the States of Kentucky and Illinois."; (W 88⁰30ʹ00ʺ--W 8... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Kentucky Geological Survey (Lexington, Ky.).
1921. Geological Survey (U.S.). Relief shown by shading and spot heights.; "Compiled from plane-table surveys by David G. Thompson ... Relief shading by John H. Renshawe."; "Water... U.S. Geological Survey (Washington, D.C).
1921. Geological Survey (U.S.). Compiled in 1920 and 1921.; "North American datum, 1921." 81 x 127 centimeters Scale 1:500,000 General Map Collection. Geological Survey (Washington, D.C).