International geomagnetic reference field 1980
Subtitle: charts and grid values
By: E. B. Fabiano....[et al.].
Contributors: Fabiano, E. B.; United States. Geological Survey.; International Association of Geomagnetism and Aeronomy.
Series: IAGA Bulletin -- No. 47; Geological Survey circular -- 873
Publisher: United States Department of the Interior,Geological Survey
Place of publication: Washington, D.C
Language: eng