Contour interval 20 feet.;"Topography from aerial photographs by photogrammetric methods and by planetable surveys. Aerial photographs taken 1957"; (W 88⁰15’00"--W 88⁰00’00"/N 37⁰45’00"--N 37⁰30’00");Relief shown by contours and spot heights.;1 map, colored;45 x 36 cm.;1:62,500