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.

雑誌
雑誌
3. Bulletin of the American Meteorological Society
American Meteorological Society
出版情報: Easton, Pa. : American Meteorological Society
巻次（年次）: Vol. 1, no. 1 (Jan. 1920)-
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4.

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