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  1. On the construction of a silvered glass telescope, fifteen and a half inches in aperture, and its use in celestial photography,
    By: Draper, Henry, - Ritchey, G. W.
    Publication info: Washington,Smithsonian Institution,1904.
    Holding Institution: University of California Libraries (archive.org)
    Subjects: Astronomical photography  Mirrors  Reflecting telescopes  
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