At: Memoirs of the Geological Survey of Great Britain, Series, Palaeontology, 4, 6 By: Crookall R.
journalAt: Memoirs of the Geological Survey of Great Britain, Series, Palaeontology, 4, 7 By: Crookall R.
bookAt: Fossil Pl. Devon. Canada, Montreal-London, Dawson Bros. [Montreal/London]; Sampson Low, Son & Marston [London] By: Dawson J. W.
bookAt: Fossil Pl. Erian (Devon.) Canada, Montreal, Gazzette Printing Company, 2 By: Dawson J. W.
journalAt: Annual Report of the United States Geological Survey, 21(1899-1900), 2 By: Knowlton F. H.
journalAt: Publications of the Carnegie Institution of Washington, 599 By: MacGinitie H. D.
journalAt: Bulletin of the United States Geological Survey, 257 By: Knowlton F. H.
journalAt: Quarterly Journal of the Geological Society of London, Part I, 18, 70=2 By: Binney E. W.
journalAt: Pollen et Spores, 10, 2 By: Venkatachala B. S., Kar R. K.
journalAt: Nature, 184, 4701 By: Cranwell L. M.