1968. Heisterkamp, A. J. and Moran, W. H. (William H.). Blue line map. 'May 1, 1951, revised January 1, 1968.' Shows township and range numbers, section boundaries without numbers, State and National For... The Survey.
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1979. Tolen, James R. Modified from Regional Geologic Map Series, Indiana Geological Survey.' Includes insets of 'Thickness of unconsolidated materials' and 'Distributio... The Survey.
1950. Title in lower right margin: Indiana, base map with highways. Scale 1:500,000. approximately 1 inch equals 8 miles; Lambert conformal conic project... The Survey.
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.
1977. Shows major highways and railroads. Scale 1:500,000; Lambert conformal conic projection. The Survey.