South-central Montana (MT)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by Geometrics
Date flown 06/72-08/72
Line spacing 3.2 (km)
Altitude 3658 (m) by barometer measurement
Total distance 1,834 (km)
References
Counties Big Horn - Carbon - Stillwater - Yellowstone - Big Horn - Park
Overlapping surveys

Data: Magnetic (M-Dz)