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Yerkes
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1897 Yerkes Observatory of University of Chicago is dedicated
1897 Otto, von, Struve, German/U.S. dir, Yerkes/MacDonald observatory 1897 Alvin Graham Clark, dies 3 weeks after 1st use of Yerkes 40" lens 1897 Yerkes Observatory 40" (1m) refractor used for 1st time |
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