Survey number: AK12 (partial - Big Delta quad only) 
Name: Big Delta - Big Delta (Big Delta quad)
Date flown: 1973
Company: LKB
Flight specs: 0.75 mile, N-S, 1000 ft above ground.
Instrument: ?

Digitized by: Esther Castellanos, 10/89 (for John Cady, USGS)
Map scale: 1:63,360 

Datum: IGRF65 (planar approximation)

Publication: State of Alaska Open Files, Big Delta quad)

Data format: Ascii format, XYZ records 
             Longitude (degrees), Latitude (degrees), Total Field (nT)
             written with FORTRAN format: (f10.5,x,f10.5,x,f8.1)