Michigan Coop '62 (MI-WI)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by U.S. Geological Survey
Date flown 09/62
Line spacing 0.4 (km)
Altitude 152.4 (m) above ground
Total distance 2,665 (km)
References
Counties Gogebic - Iron - Vilas
Overlapping surveys

Data: Magnetic (M-Dz)