Não informado. (1898). Bulletin of the Astronomical Observatory of Harvard University. Astronomical Observatory of Harvard University.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the Astronomical Observatory of Harvard University. Cambridge, Mass: Astronomical Observatory of Harvard University, 1898.
MLA-referens (8:e uppl.)Não informado. Bulletin of the Astronomical Observatory of Harvard University. Astronomical Observatory of Harvard University, 1898.
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