New Hampshire West (NH-VT)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by USGS
Date flown 07/56-08/56
Line spacing 0.8 (km)
Altitude 701.04 (m) by barometer measurement
Total distance 3,943 (km)
References
Counties Coos - Grafton - Caledonia - Essex - Orange
Overlapping surveys

Data: Magnetic (M-Dz)