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      Knowledge is Power

      Scientific American March 31, 1917

      The Present Population of the United States and its Possessions

      • By Albert A. Hopkins on March 31, 1917

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      More in the March 31, 1917 issue of Scientific American
      • Correspondence- March 31, 1917
      • The Capacity of a Coal Pile, A Vegetation Map of the United States, and more
      • Strategic Moves of the War--March 22nd, 1917
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