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Annual Mean Values of Geomagnetic Components for Selected Observatories, 1940-73
Takeshi YukutakeWilliam I. PaddockJoe Haskell Allen
出版World Data Center A for Solid Earth Geophysics, Environmental Data and Information Service, National Oceanic and Atmospheric Administration, 1979
URLhttp://books.google.com.hk/books?id=qg9AAAAAIAAJ&hl=&source=gbs_api
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