1.

図書
図書
1. Catalogue of 12,441 stars, for the epoch 1880 ; from observations made at the Royal observatory, Cape of Good Hope, during the years 1871 to 1879
Edward James Stone
出版情報: London : Printed by G.E. Eyre and W. Spottiswoode, for H.M. Stationery off., 1881
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2.

図書
図書
2. Annual report of the Chief Signal Officer to the Secretary of War for the year 1880
United States. Army. Signal Corps
出版情報: Washington : Government Printing Office, 1881
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3.

図書
図書
3. On the tidal friction of a planet attended by several satellites, and on the evolution of the solar system
by G.H. Darwin
出版情報: London : Published for the Royal Society by Trübner, 1881
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