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. 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.