San Francisco ARMS '58 (CA)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by U.S. Geological Survey
Date flown 10/58-11/58
Line spacing 1.6 (km)
Altitude 152.4 (m) above ground
Total distance 3,540 (km)
References
Counties Alameda - Amador - Calaveras - Colusa - Contra Costa - Mariposa - Merced - Placer - Sacramento - San Joaquin - Solano - Stanislaus - Sutter - Tuolumne - Yolo
Overlapping surveys

Data: Magnetic, radiometric (M/R-Dz)