The Charophyte Genus Sycidium in the Upper Devonian of Iowa

  • James E. Conkin, Takashi Sawa, Ralph G. Coy, Abdullah M. Salman
  • Micropaleontology, January 1972, JSTOR
  • DOI: 10.2307/1484980

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http://dx.doi.org/10.2307/1484980