1.

図書
図書
1. Observations of double stars made at the United States Naval Observatory (pt. 2)
by Asaph Hall, F.V. McNair
出版情報: Washington : Goverment Printing Office, 1892
シリーズ名: Washington observations ; 1888, appendix 1
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2.

図書
図書
2. Magnetic observations at the United States Naval Observatory 1891
United States Naval Observatory ; Hoogewerff, J. A.
出版情報: Washington : Government Printing Office, 1892
シリーズ名: Washington observations ; 1888, appendix 2
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3.

図書
図書
3. Observations made during the year 1888 at the United States Naval Observatory
United States Naval Observatory ; Phythian, Robert L.
出版情報: Washington : Government Printing Office, 1892
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