1.

図書
図書
1. The Williams college catalogue of north polar stars, right ascension for 1885.0
by Truman Henry Safford
出版情報: Williamstown, Mass. : Published by the College, 1888
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2.

雑誌
雑誌
2. Philosophical transactions of the Royal Society of London. A
Royal Society (Great Britain)
出版情報: London : Royal Society of London, 1888-1990
巻次（年次）: Vol. 178 (1887)-v. 331, no. 1622 (30 June 1990)
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