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      Scientific American October 1922

      The Twenty-Hour Week

      Why It Is Not Possible for the Coal Miner to Work Steadily, and What This Means to the Industry

      • October 1, 1922

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      More in the October 1922 issue of Scientific American
      • A Candidate for the British-American Cup Contest
      • Colloidal Metals That Cure Human Ills, Ammonia Table
      • Information Leaflet Issued By Patent Office
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