1.

図書
図書
1. The realm of the nebulae
by Edwin Hubble
出版情報: New Haven : Yale University Press, 1936
シリーズ名: Mrs. Hepsa Ely Silliman memorial lectures
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2.

図書
図書
2. Comparison of the large-scale structure of the galactic system with that of other stellar systems
edited by N.G. Roman
出版情報: Cambridge [Eng.] : Cambridge University Press, 1958
シリーズ名: Symposium / International Astronomical Union ; no. 5
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3.

図書
図書
3. The realm of the nebulae
by Edwin Hubble
出版情報: New York : Dover Publications, c1958
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