Survey number: 4093 (Pat Hill numbers)
Name: Healy (gridded data)
Date flown: June 1982
Company: Div. Tech
Flight specs: 1 mile spacing, N-S flightlines, 1000 ft above ground
Instrument: 

Datum: IGRF applied

Publication: USGS Open-file report 84-295

Data format: Ascii format, gridded data from contractor 
Row 1, Col 1 is in SW corner of area.

1. Row number (I5)
2. Column number (I5)
3. UTM Easting to the nearest meter (F10.0) 
4. UTM Northing to the nearest meter (F10.0)
   Note on UTM coordinates: Central meridian = -147 degrees
                            False easting = 500000 m
5. Gridded magnetic intensity value before IGRF removal, in nT (F10.2)
6. Adjusted (IGRF removed) magnetic intensity value, in nT (F10.2)

First three lines of file:

HEALY, ALASKA                      ALASKA     HIGH LIFE - QEB-147500000
    1    1   349000.  6982000.-999999.99    -70.86
    1    2   349500.  6982000.-999999.99    -62.87

Background: These data included in grid compilation for Interior Alaska
            (for published USGS Map GP-1014).  Work done by Rick Saltus,
            USGS, in cooperation with John Meyer, State of Alaska, 
            Division of Oil and Gas.