Central & Northern Penn. (PA)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by Airmag
Date flown 06/73-08/73
Line spacing 4.83 (km)
Altitude 304.8 (m) above ground
Total distance 12,714 (km)
References
Counties Allegany - Carroll - Frederick - Garrett - Washington - Sussex - Warren - Allegany - Broome - Cattaraugus - Chautauqua - Chemung - Delaware - Orange - Steuben - Sullivan - Tioga - Ashtabula - Trumbull - Adams - Bedford - Blair - Bradford - Cambria - Cameron - Carbon - Centre - Clarion - Clearfield - Clinton - Crawford - Cumberland - Dauphin - Elk - Erie - Forest - Franklin - Fulton - Huntingdon - Indiana - Jefferson - Juniata - Lackawanna - Luzerne - Lycoming - McKean - Mercer - Mifflin - Monroe - Northampton - Perry - Pike - Potter - Snyder - Somerset - Sullivan - Susquehanna - Tioga - Union - Venango - Warren - Wayne - Westmoreland - Wyoming - York - Morgan
Overlapping surveys

Data: Magnetic (M-Dz)