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      Knowledge is Power

      Scientific American April 15, 1911

      Good Coal and Poor

      Purchase of Coal on the Basis of Its Heating Value

      • By J. A. Holmes on April 15, 1911

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      More in the April 15, 1911 issue of Scientific American
      • Combating the Sleeping Sickness
      • Lamps of To-day
      • The Current Supplement, Tipping the Shores of Hudson Bay
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