1.

図書
図書
1. Results of observations made at the united states coast and geodetic survey magnetic observatory at vieques, Porto Rico (1907, 1908 - 1921, 1922)
Daniel L. Hazard
出版情報: Washington : Government Printing Office, 1911-
シリーズ名: Serial / Department of Commerce U.S. coast and geodetic survey ; no. 33, 90, 168, 239, 292
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2.

図書
図書
2. Results of observations made at the united states coast and geodetic survey magnetic observatory near Honolulu, Hawaii (1907, 1908 - 1921, 1922)
by Daniel L. Hazard
出版情報: Washington : Government Printing Office, 1911-
シリーズ名: Serial / Department of Commerce U.S. coast and geodetic survey ; no. 21, 86, 200, 276
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