"Plate LXXXVII. Map showing the distribution of the marl deposits of Indiana." Detached from: Handbook of Indiana geology, part 2 / by W. N. Logan, E. R. Cumings, C. A. Malott, S. S. Visher, W. M. Tucker, J. R. Reeves. Indianapolis : Wm. B. Burford, contractor for state printing and binding, 1922. Page 774., Imprint: Wm. B. Burford, contractor for state printing and binding, Dimensions: on sheet 18 x 32 cm; Scale: Scale not given.
Logan, William Newton, 1869-1941 (1922). Marl areas of Indiana. Indiana. Division of Geology. https://purl.dlib.indiana.edu/iudl/images/VAC3073/VAC3073-M-01124 (map)