Advance (MO)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by Fairch.
Date flown 07/63
Line spacing 0.8 (km)
Altitude 304.8 (m) by barometer measurement
Total distance 781 (km)
References
Counties Bollinger - Cape Girardeau - Scott - Stoddard
Overlapping surveys

Data: Magnetic (M-Dz)