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Cycads: Evidence from the Upper Pennsylvanian

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Science  18 Apr 1969:
Vol. 164, Issue 3877, pp. 294-295
DOI: 10.1126/science.164.3877.294

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vol. 164 no. 3877 294-295

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  1. Thomas N. Taylor1
  1. 1Department of Biological Sciences, University of Illinois at Chicago Circle, Chicago 60680

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