Massachusetts Coop '61 (MA-VT-NH)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by U.S. Geological Survey
Date flown 09/61
Line spacing 1.6 (km)
Altitude 152.4 (m) above ground
Total distance 875 (km)
References
Counties Berkshire - Franklin - Hampshire - Cheshire - Bennington - Windham
Overlapping surveys

Data: Magnetic (M-Dz)