At: Zeitschrift für geologische Wissenschaften, 1, 8 By: Knobloch E.
bookAt: Iskop. Tsvetk. Rast. SSSR, Leningrad, Izdatel'stvo Nauka, Leningradskoe otdelenie, 1974, 1 By: Iljinskaja I. A.
journalAt: Jahrbuch des Staatlichen Museums für Mineralogie und Geologie zu Dresden, 1955, 2 By: Krutzsch W.
journalAt: Plant Systematics and Evolution, 260, 2 By: Friis E. M., Pedersen K. R., Schönenberger J.
journalAt: Acta Biologica (Szeged), 17, 1–4 By: Kedves M., Hegedűs M., Bohony E.
journalAt: Geoscience and Man, 7 By: Nichols D. J.
bookAt: N. Amer. Geol. Palaeont., Cincinnati, Ohio, Western Methodist book concern By: Miller S. A.
bookAt: N. Amer. Geol. Palaeont., Cincinnati, Ohio, Western Methodist book concern, Appendix I By: Miller S. A.
bookAt: N. Amer. Geol. Palaeont., Cincinnati, Ohio, Western Methodist book concern, Appendix II By: Miller S. A.
journalAt: Professional Papers / United States Geological Survey, 294, A By: Peck R. E.