Geological Survey (U.S.) & Fabiano, E. B. (1983). International geomagnetic reference field 1980: Charts and grid values. U.S. Dept. of the Interior, Geological Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.) and Eugene B. Fabiano. International Geomagnetic Reference Field 1980: Charts and Grid Values. [Reston, Va.]: U.S. Dept. of the Interior, Geological Survey, 1983.
MLA (9th ed.) CitationGeological Survey (U.S.) and Eugene B. Fabiano. International Geomagnetic Reference Field 1980: Charts and Grid Values. U.S. Dept. of the Interior, Geological Survey, 1983.
Warning: These citations may not always be 100% accurate.