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- [23] INTERNATIONAL GEOMAGNETIC REFERENCE FIELD 1980 - CHARTS AND GRID VALUES (IAGA BULLETIN NO-47) GEOLOGICAL SURVEY CIRCULAR, 1983, (873): : 1 - &
- [24] EVALUATION OF MODELS PROPOSED FOR THE 1991 REVISION OF THE INTERNATIONAL GEOMAGNETIC REFERENCE FIELD JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY, 1992, 44 (09): : 793 - 803
- [28] ANALYSIS OF GEOMAGNETIC SECULAR VARIATION DURING 1980-1985 AND 1985-1990, AND GEOMAGNETIC MODELS PROPOSED FOR THE 1991 REVISION OF THE INTERNATIONAL GEOMAGNETIC REFERENCE FIELD JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY, 1992, 44 (09): : 735 - 743