Central New Hampshire '68 (NH)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by USGS
Date flown 07/68
Line spacing 0.8 (km)
Altitude 1524 (m) by barometer measurement
Total distance 1,561 (km)
References
Counties Oxford - York - Belknap - Carroll - Grafton - Merrimack - Strafford - Sullivan
Overlapping surveys

Data: Magnetic (M-Dz)