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      Knowledge is Power

      Scientific American April 29, 1871

      Cochineal Insects and their Allies

      • By E. C. H. Day on April 29, 1871

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      More in the April 29, 1871 issue of Scientific American
      • Mining Schools in the United States
      • Queries- April 29, 1871
      • Uses of Infusorial Silica
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