Results of observations with the wharton reflex zenith tube and the zenith telescope of the Flower Astronomical Observatory : from January 9, 1904, to December 3, 1906
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Results of observations with the wharton reflex zenith tube and the zenith telescope of the Flower Astronomical Observatory : from January 9, 1904, to December 3, 1906
（Publications of the University of Pennsylvania, v. 3,
John C. Winston Co., 1908
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