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Some Summary Geomagnetic Activity Data, 1932-1976

H. Meijers

出版	National Geophysical and Solar-Terrestrial Data Center, NOAA/Environmental Data Service, 1977
URL	http://books.google.com.hk/books?id=OrMRAQAAIAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN