Alaska Regional (AK)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by U.S. Geological Survey
Date flown 07/65
Line spacing 16.1 and 12.4 (km)
Altitude 1524 (m) by barometer measurement
Total distance 14,484 (km)
References
Counties Denali - Fairbanks North Star - North Slope - Southeast Fairbanks - Yukon-Koyukuk
Overlapping surveys

Data: Magnetic (M-Dz)