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Ringmikrometer-Beobachtungen von Cometen
1893
Astronomical Notes - Astronomische Nachrichten
a n g e s t e l I t a m H e l i o m e t e r d e r S t e r n w a r t e z u K o n i g s b e r g v o n Dr. Frzta C Q~.
doi:10.1002/asna.18931330404
fatcat:sjhullz2dng23f5qsadmjdiqjy