Grid values for the IGRF 1965 edited by B. R. Leaton and D. R. Barraclough - Paris International Union of Geodesy and Geophysics 1971 - 140p. - International Association of Geomagnetism and Aeronomy Symposium; No. 29 . Subjects--Topical Terms: IuggIaga Universal Decimal Class. No.: 550.38 / IAGA