Magnetic models for the United States for 1985 /
Peddie, Norman W.
Zunde, Audronis K.
Washington : U.S. G.P.O. ; Denver, CO : For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Federal Center,
1990.
Includes bibliographical references (p. 5).
Geomagnetism
Geomagnetism