Southwest Virginia (VA)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by Aero
Date flown 02/62-04/62
Line spacing 2.41 (km)
Altitude 1524 (m) by barometer measurement
Total distance 4,828 (km)
References
Counties Bell - Harlan - Letcher - Pike - Ashe - Claiborne - Hancock - Hawkins - Johnson - Sullivan - Bland - Buchanan - Carroll - Dickenson - Grayson - Lee - Russell - Scott - Smyth - Tazewell - Washington - Wise - Wythe - Bristol - Norton - McDowell - Mercer - Mingo
Overlapping surveys

Data: Magnetic (M-Dz)