On Gray and Milne's Seismographic Apparatus

  • T. Gray
  • Quarterly Journal of the Geological Society, January 1883, Geological Society of London
  • DOI: 10.1144/gsl.jgs.1883.039.01-04.17

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http://dx.doi.org/10.1144/gsl.jgs.1883.039.01-04.17