Greenville '57 (ME)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by U.S. Geological Survey
Date flown 08/57
Line spacing 0.8 (km)
Altitude 152.4 (m) above ground
Total distance 1,882 (km)
References
Counties Piscataquis - Somerset
Overlapping surveys

Data: Magnetic (M-Dz)