At: Johns Hopkins University Studies in Geology, 5 By: Hollick A., Berry E. W.
journalAt: Publications of the Carnegie Institution of Washington, 476 By: Dorf E.
journalAt: Contributions from the Museum of Paleontology, University of Michigan, 15, 10 By: Arnold C. A.
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journalAt: Ezhegodnik Russkogo Paleontologicheskogo Obshchestva, 1928-1929, 8 By: Kryshtofovich A. N.
journalAt: Palaeontographica, Abtheilung, B, Paläophytologie, 117, 1-3 By: Omara S., Schultz G.
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