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      Scientific American April 16, 1910

      Macrographic Examination of Metals, Big Fir Trees of the Northwest

      • April 16, 1910

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      More in the April 16, 1910 issue of Scientific American
      • Estimation of the Working Capacity of a Man Before and After an Accident
      • How Gamblers Cheat
      • The Mercury Vapor Lamp and its Effect on the Eye, The Current Supplement and more
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