Naval Pet. Reserve No. 4 (AK)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by U.S. Geological Survey, U.S. Navy
Date flown 07/45-08/46
Line spacing 3.2 and 2.5 (km)
Altitude 30 to 1524 (m) above ground
Total distance 20,277 (km)
References
Counties North Slope
Overlapping surveys

Data: Magnetic (M-Dz)