Culture and drainage in part compiled from aerial photographs taken 1938. Topography by plane-table methods 1946.;Contour interval 20 feet.;Coordinates (W 88⁰30’00"--W 88⁰15’00"/N 38⁰30’00"--N 38⁰15’00");Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500