Northwest Montana '67 (MT)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by USGS
Date flown 07/67
Line spacing 3.22 (km)
Altitude 2743.2 (m) by barometer measurement
Total distance 4,345 (km)
References
Counties Flathead - Glacier - Lake - Lewis and Clark - Pondera - Teton - Toole
Overlapping surveys

Data: Magnetic (M-Dz)