1.

図書
図書
1. Understanding variable stars (: hbk)
John R. Percy
出版情報: Cambridge : Cambridge University Press, 2007
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2.

図書
図書
2. Amateur - professional partnerships in astronomy : proceedings of a meeting held at University of Toronto, Toronto, Canada 1-7 July 1999
edited by John R. Percy and Joseph B. Wilson
出版情報: San Francisco, Calif. : Astronomical Society of the Pacific, c2000
シリーズ名: Astronomical Society of the Pacific conference series ; v. 220
A series of books on recent developments in astronomy and astrophysics
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3.

図書
図書
3. Understanding variable stars (pbk.)
John R. Percy
出版情報: Cambridge : Cambridge University Press, 2011
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