Columbus ARMS (OH-IN)

Survey type M-Dz (magnetic; digitized from contour maps)
Flown by USGS
Date flown 09/60-11/60
Line spacing 1.61 (km)
Altitude 152.4 (m) above ground
Total distance 18,910 (km)
References
Counties Fayette - Franklin - Jay - Randolph - Union - Wayne - Athens - Auglaize - Butler - Champaign - Clark - Clinton - Darke - Delaware - Fairfield - Fayette - Franklin - Greene - Hardin - Hocking - Knox - Licking - Logan - Madison - Marion - Mercer - Miami - Montgomery - Morrow - Perry - Pickaway - Preble - Ross - Shelby - Union - Warren
Overlapping surveys

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