Southeast Missouri '48 (MO)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by USGS
Date flown 11/46-?/48
Line spacing 0.4 (km)
Altitude 548.64 (m) by barometer measurement
Total distance 14,750 (km)
References
Counties Franklin - Jefferson - Saint Francois - Washington
Overlapping surveys

Data: Magnetic (M-Dz)