"Conservation Commission, Stanley Coulter, Chairman." "The based used...is the Ryse map, which has been modified." Includes geologic cross sections., Imprint: [Indianapolis] : Dept. of Conservation, State of Indiana, 1932., Dimensions: 177 x 112 cm; Scale: 1:253,440, Coordinates: W0870000 W0850000 N0410000 N0380000
Indiana. Division of Geology (1932). Geological map of Indiana. Indiana. Department of Conservation. https://purl.dlib.indiana.edu/iudl/images/VAC3073/VAC3073-M-00989 (map)