1877. Mitchell, S. Augustus(Samuel Augustus), 1792-1868, cartographer. Prime meridian: Washington.; Detached from an atlas, no. 68. Scale approximately 1:1,300,000. S. Augustus Mitchell.
1860. Mitchell, S. Augustus (Samuel Augustus),1792-1868. Prime meridians: Greenwich, Washington. Imprint from copyright statement. Scale approximately 1:2,281,000. Approximately 1 inch to 38 miles. S. Augustus Mitchell.
1972. Gray, Henry Hamilton,1922-cartographer., Forsyth, Jane L. (Jane Louise),1921-cartographer., Schneider, Allan F. (Allan Frank),1926-cartographer., and Gooding, Ansel Miller. Base map modified from Army Map Service, Map NJ 16-3, 1964.' Includes text, cross section, columnar section, diagram, schematic section, ancillary ... Indiana Geological Survey.
1977. Bower, C. W. Date 2-10-66.' Indexed for points of interest. Scale not given. Dwg. by C.W. Bower; courtesy of Indiana & Michigan Electric Co.