Philadelphia (PA)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by Airmag
Date flown 06/74-07/74
Line spacing 1.61 (km)
Altitude 304.8 (m) above ground
Total distance 724 (km)
References
Counties Burlington - Camden - Gloucester - Mercer - Bucks - Delaware - Montgomery - Philadelphia
Overlapping surveys

Data: Magnetic (M-Dz)