Annette Island, Alaska, aeromagnetic survey Publication: Northwest Mining Guidebook, Special Symposium 1993, Godwin & Smith, eds., R.J. Horton, Airborne Geophysical Surveys of the Annette Island Reserve, p. 27-32 (chapt 5). Data fields: Flightline number Longitude Latitude Total field anomaly = total field = IGRF Total field Height above terrain (meters) Barometric altitude (meters) Fiducial number Year and date (YYMMDD.0) Fortran format: (a8,f10.4,f9.4,f8.2,f9.2,3f8.2,f11.3)