1968. Moran, W. H. (William H.) and Heisterkamp, A. J. 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.
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. Henderson, John R., cartographer. Includes text and location map. Scale approximately 1:63,360. The Survey.