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Magnetic Observations at the United States Naval Observatory 1888 and 1889 by Ensign J. A. Hoogewerff, U.S. Navy. Captain F. V. McNair, U.S. Navy, Superintendent
United States Naval Observatory
出版U.S. Government Printing Office, 1890
URLhttp://books.google.com.hk/books?id=79DmAAAAMAAJ&hl=&source=gbs_api
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