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 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>IuggIaga
<br/><br/><label>Universal Decimal Class. No.: </label>550.38  / IAGA