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      Scientific American April 17, 1886

      The Geological Hall of the American Museum of Natural History

      • By L. P. Gratacap on April 17, 1886

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      More in the April 17, 1886 issue of Scientific American
      • An Engine and Boiler for Good Service
      • Engineering Inventions - April 17, 1886
      • Mechanics' Keying Clamp
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