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Evidence of Pollen Tubes in Paleozoic Pteridosperms

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Science  18 Feb 1972:
Vol. 175, Issue 4023, pp. 772-774
DOI: 10.1126/science.175.4023.772

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vol. 175 no. 4023 772-774

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    1. Gar W. Rothwell1
    1. 1Department of Botany, University of Alberta, Edmonton 7, Alberta, Canada

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