At: American Journal of Botany, 80, 8 By: Herendeen P. S., Crepet W. L., Nixon K. C.
bookAt: Chlor. Protogaea, Leipzig, Wilhelm Engelmann, 1841, 1 By: Unger F.
bookAt: Chlor. Protogaea, Leipzig, Wilhelm Engelmann, 1842, 2-3 By: Unger F.
bookAt: Chlor. Protogaea, Leipzig, Wilhelm Engelmann, 4-5 By: Unger F.
bookAt: Chlor. Protogaea, Leipzig, Wilhelm Engelmann, 6-7 By: Unger F.
bookAt: Chlor. Protogaea, Leipzig, Wilhelm Engelmann, 8-9 By: Unger F.
journalAt: Palaeontographica, Abtheilung, B, Paläophytologie, 284, 1-3 By: Kowalski R.
journalAt: Annale van die Geologiese Opname / Republiek van Suid-Afrika, Departement van Mynwese, 3 By: Hart G. F.
bookAt: Beitr. Petref.-Kunde, Bayreuth, im Verlag der Buchner'schen Buchhandlung, 6 By: Münster G.
bookAt: Chosakuronbun Mokuroku, Tokyo, Imperial University By: Nakai T.