1.

図書
図書
1. Fundamental catalogue of 1846 stars for the equinox 1900 : from observations made at the Royal observatory, Cape of Good Hope, during the years 1912-1916
under the direction of S. S. Hough
出版情報: Edinburgh : H. M. Stationery off, 1920
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2.

図書
図書
2. Space, time and gravitation : an outline of the general relativity theory
by A.S. Eddington
出版情報: Cambridge : Cambridge University Press, 1920
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3.

図書
図書
3. The book of stars
by A. Frederick Collins
出版情報: New York : Appleton, 1920
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