Idaho-Montana (ID-MT)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by Geometrics
Date flown 06/72-10/72
Line spacing 3.2 (km)
Altitude 3658 (m) by barometer measurement
Total distance 8,770 (km)
References
Counties Fremont - Lemhi - Beaverhead - Gallatin - Madison - Park - Park
Overlapping surveys

Data: Magnetic (M-Dz)