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  1. 1
    by Pitman, John Himes, 1890-
    Published 1920
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    Parallaxes of fifty stars determined at the Sproul Observatory.
  2. 2
    by Pitman, John Himes, 1890-
    Published 1930
    Other Authors “...Kovalenko, Michel...”
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    Parallaxes of fifty stars determined at the Sproul Observatory.

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