Maryland Coop '70 (MD-WV-VA-PA)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by USGS
Date flown 06/70
Line spacing 1.61 (km)
Altitude 1066.8 (m) by barometer measurement
Total distance 5,359 (km)
References
Counties Allegany - Frederick - Garrett - Washington - Bedford - Fayette - Franklin - Fulton - Somerset - Loudoun - Berkeley - Grant - Hampshire - Jefferson - Mineral - Morgan - Preston
Overlapping surveys

Data: Magnetic (M-Dz)