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journalAt: Phytologia Balcanica, 11, 3 By: Palamarev E. Kh., Bozukov V., Uzunova K., Petkova A. S., Kitanov G. B.
journalAt: Memoirs of the Geological Society of America, 51 By: LaMotte R. S.
bookAt: Cat. Hutton Coll., Newcastle-upon-Tyne & London, published for the Institute by Andrew Reid [Newcastle-upon-Tyne], & Longmans and Company [London] By: Lebour G.
journalAt: Nationaal Natuurhistorisch Museum Technical Bulletin, 7 By: van Konijnenburg-van Cittert J. H. A., van Waveren I. M., Jonkers J. B.
journalAt: Bulletin of the United States National Museum, 53, 2 By: Peale A. C.
bookAt: Cat. Types Fig. Specim. Foss. Pl. Geol. Surv. Canada, Ottawa, Roger Duhamel, F.R.S.C. Queen's Printer and Controller of Stationery By: Bell W. A.
journalAt: Bulletin de la Société Géologique de France, Series 4, 19, [5] 7-9 By: Dollfus G.-F., Fritel P.-H.
journalAt: Canadian Journal of Botany, 69, 4 By: Hao S.-G., Beck C. B.
journalAt: American Journal of Botany, 26, 6 By: Cribbs J. E.