1970. Hollingsworth, John McHenry, 1823-1889 and Kingsbury, Robert C. Relief shown by contours and gradient tints. Detached from: Kingsbury, Robert C. Atlas of Indiana, page 12. Scale approximately 1:2,000,000. Department of Geography, Indiana University.
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1970. Appears to be a reprint of a map from the 1975 Lake Monroe Land Suitability Study. Scale approximately 1:24,000.