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