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      Scientific American February 1955

      The Amateur Scientist

      About tiny mineral specimens and other matters, including a troublesome puzzle

      • By Albert G. Ingalls on February 1, 1955

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      More in the February 1955 issue of Scientific American
      • 50 and 100 Years Ago: February 1955
      • Ears for Computers
      • The Authors
      View Full Contents
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