Modoc North-central (CA)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by Aero Service Corporation
Date flown ?/57
Line spacing 3.2 (km)
Altitude 2134 (m) by barometer measurement
Total distance 1,182 (km)
References
Counties Modoc - Klamath - Lake
Overlapping surveys

Data: Magnetic (M-Dz)