This map portrays ground conditions prior to the earthquake of August 17, 1959.
Relief shown by contours and spot heights.
Topography from aerial photographs by photogrammetric methods for the Bureau of Reclamation 1948, and by the Geological Survey 1958. Aerial photographs taken 1947 and 1954. Field checked 1958.
1958
N4445-W11100/15.
1927 North American datum.
Land lines unsurveyed in T. 9 S.-R. 4 E. and T 10 S.-Rs. 4 and 5 E.