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Paleobotany and the evolution of plants
Oleh Wilson Nichols Stewart, Gar W. Rothwell
Morphologic and taxonomic relationships of the Psilotaceae relative to evolutionary lines in early land vascular plants
Journal Brittonia
Publisher Springer New York
ISSN 0007-196X (Print) 1938-436x (Online)
Issue Volume 29, Number 1 / January, 1977
DOI 10.2307/2805739
Pages 14-29

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