1.

図書
図書
1. Magnetic observations at the United States Naval Observatory 1888 and 1889
United States Naval Observatory ; Hoogewerff, J. A.
出版情報: Washington : Government Printing Office, 1890
シリーズ名: Washington observations ; 1886, appendix 1
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2.

図書
図書
2. Instruments and publications of the United States Naval observatory
United States Naval Observatory
出版情報: Washington : Published by authority of the Hon. secretary of the Navy, 1845-1876
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3.

雑誌
雑誌
3. Report of the superintendent of the United States Naval Observatory for the year ending ...
United States Naval Observatory
出版情報: Washington, D.C. : G.P.O., -1905
巻次（年次）: -1905 (1905)
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