"R"--Lower right corner of map. "Fig. CXIII." Color map. In Indiana. Division of Geology's Handbook of Indiana Geology, 1922. Indianapolis : Dept. of Conservation, Division of Geology, 1922. Between pages 830 and 831. Indiana Department of Conservation Publication 21. Imprint: [Indianapolis] : Dept. of Conservation, Division of Geology, [1922] Dimensions: 47 x 31 cm