1927 North American datum.
Relief shown by contours and spot heights.
Forested areas overprinted in green.
Topography from aerial photographs by photogrammetric methods. Aerial photographs taken 1949 and 1951. Field check 1956.
Land lines unsurveyed except in parts of T. 55 N., Rs. 105 and 106 W. and T. 56 N., R. 106 W.
1956.
N4445-W10930/15.
AMS 4073 I--series V774.