Pennsylvania Triassic '57 (PA-MD)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by USGS
Date flown 03/57-04/57
Line spacing 0.4 (km)
Altitude 152.4 (m) above ground
Total distance 18,958 (km)
References
Counties Baltimore - Carroll - Frederick - Adams - Berks - Chester - Cumberland - Dauphin - Lancaster - Lebanon - York
Overlapping surveys

Data: Magnetic (M-Dz)