Northwest Iowa (IA)

Survey type M-A (magnetic; derived from analog data)
Flown by Aero
Date flown ?/64
Line spacing 1.61 (km)
Altitude 304.8 (m) above ground
Total distance 19,199 (km)
References
Counties Buena Vista - Calhoun - Carroll - Cherokee - Clay - Crawford - Dickinson - Emmet - Hamilton - Hancock - Harrison - Humboldt - Ida - Kossuth - Lyon - Monona - O'Brien - Osceola - Palo Alto - Plymouth - Pocahontas - Sac - Shelby - Sioux - Winnebago - Woodbury - Worth - Wright - Faribault - Freeborn - Jackson - Martin - Nobles - Rock - Burt - Dakota - Thurston - Washington - Lincoln - Minnehaha - Union
Overlapping surveys

Data: Magnetic (M-A)