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journalAt: Botanical Gazette, 110, 1 By: Sahni B.
journalAt: Second Geological Survey of Pennsylvania Report of Progress, PP By: Fontaine W., White I. C.
bookAt: Compt. Rendu 4ème Congr. Stratigr. Géol. Carbonif. Heerlen, 1958, Maestricht, Ernest van Aelst, 2 By: Plumstead E. P.
journalAt: Transactions of the American Microscopical Society, 29 By: Bessey C. E.
journalAt: Boletim da Sociedade Broteriana, Ser. 2, 21 By: Reed C. F.
journalAt: Professional Papers / United States Geological Survey, 98, E By: Berry E. W.
journalAt: Professional Papers / United States Geological Survey, 98, F By: Berry E. W.
journalAt: Publications of the Carnegie Institution of Washington, 590 By: Axelrod D. I.
journalAt: American Journal of Botany, 71, 3 By: Wing S. L., Hickey L. J.