Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1940-1941. Topography by plane-table methods, 1926, 1930, 1945, and 1949."; (W 89⁰15ʹ00ʺ--W 89⁰00ʹ00ʺ/N 40⁰30ʹ00ʺ--N 40⁰15ʹ00ʺ);Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500