Mackay, B. R. (Bertram Reid), 1885-Relief shown by contours.; "Topography 1917."; Includes "explanation of map" and description of "routes to Dune Park" by Rollin D. Salisbury.18 x 18 centimeters, on sheet 32 x 23 centimetersJPEGUMN_ALMA:9973518754501701engGeographic Society of Chicago (Chicago)PublicDune Park sheet, IndianaMapsIndiana1917?University of Minnesota