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http://worldcat.org/entity/work/id/1218857242

Sun-spot drawings made at the Georgetown College Observatory in 1850, September 20 to November 6

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  • "Sun-spot drawings made at the Georgetown College Observatory in 1850, September 20 to November 6"@en
  • "Sun-spot drawings made at the Georgetown College Observatory in 1850, September 20 to November 6"