Southern Iowa (IA)

Survey type M-A (magnetic; derived from analog data)
Flown by LKB
Date flown ?/72
Line spacing 1.61 (km)
Altitude 609.6 (m) by barometer measurement
Total distance 8,546 (km)
References
Counties Hancock - Henderson - Adams - Appanoose - Clarke - Davis - Decatur - Des Moines - Fremont - Henry - Jefferson - Lee - Lucas - Mills - Monroe - Montgomery - Page - Ringgold - Taylor - Union - Van Buren - Wapello - Wayne - Atchison - Clark - Harrison - Mercer - Nodaway - Putnam - Schuyler - Scotland - Worth - Cass - Nemaha - Otoe
Overlapping surveys

Data: Magnetic (M-A)