At: Geologica Bavarica, 46 By: Wolf M.
journalAt: CSIRO Division of Coal Research Technical Communication, 25 By: Balme B. E.
bookAt: Rept. XVII Inter. Geol. Congr. 1937, Moscow, GONTI, 1 By: Naumova S. N.
journalAt: Transactions of the Illinois State Academy of Science, 28, 2 By: Schopf J. M.
journalAt: Acta botanica Academiae Scientiarum Hungaricae, 12, 1-2 By: Bóna J.
journalAt: Report of investigations Illinois State Geological Survey, 50 By: Schopf J. M.
journalAt: American Midland Naturalist, 18, 1 By: Berry E. W.
journalAt: Annales de la Société Géologique du Nord, 79 By: Delcourt A. F. L. G., Sprumont G.
journalAt: Pratsi Odes'koho Derzhavnoho Universytetu, 27, 2, 2 (54) By: Stepanov V. V.
journalAt: Professional Papers / United States Geological Survey, 1448 By: Frederiksen N. O.