Ault, Curtis H.Webb, William M.Includes generalized columnar section, "Sectionized township," and index of producers of clay and clay products. "Base modified from U.S. Geological Survey, Base map of Indiana, 1950."Imprint: [Bloomington] : Indiana Geological Survey, 1968.Dimensions: 51 x 64 cm; Scale: 1:1,000,000Coordinates: W0880500 W0844700 N0414500 N0374600JPEGVAC3073-M-00832G4091.M2 1968 .W42engIndiana. Geological SurveyPublicShaleClay industriesClayLocations of clay and shale operations in IndianaMapsIndiana1968Indiana University