Black and Blue Range (NM-AZ)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by U.S. Geological Survey
Date flown 03/68
Line spacing 1.6 (km)
Altitude 3200 (m) by barometer measurement
Total distance 7,893 (km)
References
Counties Greenlee - Catron - Grant - Sierra - Socorro
Overlapping surveys

Data: Magnetic (M-Dz)