Magnetic declination in the United States for January 1, 1920
著者
書誌事項
Magnetic declination in the United States for January 1, 1920
(Special publication, no. 90)(Serial / Department of Commerce U.S. coast and geodetic survey, no. 215)
Government Printing Office, 1922
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注記
"Terrestrial magnetism"
At head of title: Department of Commerce. U.S. Coast and Geodetic Survey