At: Palaeontologia Electronica, 25, 1a5 By: Heřmanová Z., Čepičková J., Kvaček J., von Balthazar M., Schönenberger J.
journalAt: Rivista Italiana di Paleontologia e Stratigrafia, 127, 2 By: Mazaheri-Johari M., Kustatscher E., Roghi G., Ghasemi-Nejad E., Gianolla P.
bookAt: Monogr. Silur. Foss. Girvan, Edinburgh & London, William Blackwood and Sons, 2 By: Nicholson H. A., Etheridge R., Jr.
bookAt: Monogr. Silur. Foss. Girvan, Edinburgh & London, William Blackwood and Sons, 1 By: Nicholson H. A., Etheridge R., Jr.
bookAt: Monogr. Silur. Foss. Girvan, Edinburgh & London, William Blackwood and Sons, 3 By: Nicholson H. A., Etheridge R., Jr.
journalAt: Palaeontographical Society, [3], 1(5) By: King W.
journalAt: Memoirs from the Department of Botany of Columbia College, 1 By: Small J. K.
journalAt: Palaeontographical Society, 30, 134 By: Brady H. B.
journalAt: Torreya, 26, 4 By: Cockerell T. D. A.
journalAt: Annals of the Carnegie Museum, 23 By: Tolmachoff I. P.