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Sundials: History, Theory, and Practice , Rohr, René R.J. - Amazon.com
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Geometrical Investigation of the Formation of Images in Optical Instruments. Embodying the Results of Scientific Researches Conducted in German Optical Workshops: ed, Rohr M. von (Moritz) 1868-1940.: 9781313045490: Amazon.com: Books
Die Brille als optisches Instrument (Vol-1) (German Edition): Rohr, M. von: Amazon.com: Books