1961. Hutchison, Harold C. (Harold Christy), 1925-. Preliminary coal map no. 9--Margin.; Includes 1 ancillary map, 1 diagram showing township enumeration, 1 index map, 1 stratigraphic column, and 1 c... Indiana Dept. of Conservation, Geological Survey.
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1961. Blue-line print.; Hand annotated in color to show locations of industrial groups.; Typewritten legend with colored annotations and annotations in i... Metropolitan Planning Dept.
1961. Walker, Alfred C. Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water Map side also contains legend and explanation of map symbols. Scale bar lower right... Ohio. Division of Water.
1961. Title in lower right margin: Indiana, base map. Scale 1:500,000. 1 in. equals approximately 8 miles; Lambert conformal conic projection. The Survey.
1961. Blue line print.; Date of photography March 1961.; Date of mapping May 1961. Scale 1:1,200. 1 inch = 100 feet. Indiana Univ. Physical Plant.