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      Celebrate Math Awareness Month

      Scientific American June 20, 1891

      Simple Apparatus for Gathering and Examining Microscopic Objects

      • By M. Hopkins

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      More in the June 20, 1891 issue of Scientific American
      • An Improved Car Coupling
      • Index of Inventions- June 20, 1891
      • The Proposed New Croton Lake Dam and the New Croton Lake
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