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      Knowledge is Power

      Scientific American December 15, 1900

      Modern Soft-Coal Mining and Handling in the United States

      • By Henry Hale on December 15, 1900

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      More in the December 15, 1900 issue of Scientific American
      • A Safety Attachment for Water-Gages
      • Electric Tramways in London
      • Notes and Queries - December 15, 1900
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