Baltimore Gneiss (MD)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by USGS
Date flown 01/64-02/64
Line spacing 0.8 and 1.61 (km)
Altitude 152.4 (m) above ground
Total distance 3,307 (km)
References
Counties Anne Arundel - Baltimore - Carroll - Frederick - Harford - Howard - Montgomery - Prince George's - Baltimore - Adams - York
Overlapping surveys

Data: Magnetic (M-Dz)