1927 North American datum.
Relief shown by contours and spot heights.
Forested areas overprinted in green.
Topography from 1:24,000-scale map of Sunny Divide 7.5 minute quadrangle, surveyed 1954; and from aerial photographs by photogrammetric methods. Aerial photographs taken 1953-1954. Field check 1957.
1957
N4415-W10430/15.
AMS 5072 I--series V774.