At: Bulletin of the United States Geological Survey, 1893, 108 By: Knowlton F. H.
journalAt: International Journal of Life Sciences, 2, 4 By: Meshram S. M., Borkar S.
journalAt: Proceedings of the Royal Society of London, 1879, 29, 198 By: von Ettingshausen C.
journalAt: Geological Survey Branch, Department of Mines, Canada, 1013 By: Penhallow D. P.
journalAt: Memoirs of the Museum of Comparative Zoology at Harvard College, 6, 2 By: Lesquereux L. C.
journalAt: Quarterly Journal of the Geological Society of London, Part 1, 9, 3=35 By: Bunbury C. J. F., Sr
journalAt: Annual Report of the Geological Survey of Texas, 3(1891) By: Cummins W. F.
bookAt: Rept. Geol. Coast. Plain Alabama, Montgomery, Ala., Brown Printing Co., state printers By: Smith E. A., Johnson L. C., Langdon D. W.
journalAt: Proceedings of the Royal Society of London, 30, 202 By: von Ettingshausen C.
journalAt: Bulletin of the Museum of Comparative Zoology at Harvard College, in Cambridge, 7, 1 By: Lesquereux L. C.