Survey number: 3030 (Pat Hill number)
Name: Southeast Alaska 1973 survey 
Date flown: 8/73 - 9/73
Company: GeoMetrics
Flight specs: 1 mile, N63E, 6000 ft barometric.
Instrument: GeoMetrics Proton Magnetometer model G-803

Digitized by: Esther Castellanos, 6/96
Map scale: 1:63,360 

Datum: data have IGRF 1965 updated to 1973 applied
       (This was evidently applied as a planar surface within each
        15'x20' 1:63,360 quad)

Publication: USGS Bulletin B-1525

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)

Background: These data were digitized under the direction of Rick Saltus 
            (saltus@usgs.gov) as part of the USGS project to merge the best 
            available aeromagnetic data into a consistent grid for the state 
            of Alaska.