Boulder Batholith (MT)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by USGS
Date flown 08/53-11/53
Line spacing 3.22 (km)
Altitude 3200.4 (m) by barometer measurement
Total distance 4,973 (km)
References
Counties Beaverhead - Broadwater - Deer Lodge - Gallatin - Granite - Jefferson - Lewis and Clark - Madison - Meagher - Powell - Silver Bow
Overlapping surveys

Data: Magnetic (M-Dz)