At: Journal of the Academy of Natural Sciences of Philadelphia, 6, March By: Harlan R.
journalAt: Bulletin of the American Association of Petroleum Geologists, 13, 7 By: White D.
journalAt: Report (Annual) of the Arkansas Geological Survey, 1889, 2 By: Knowlton F. H.
journalAt: Botanical Magazine, 40, 469 By: Yasui K.
journalAt: Proceedings of the United States National Museum, 35, 1639 By: Knowlton F. H.
journalAt: Transactions of the Botanical Society of Edinburgh, 1, 1 By: Paterson R.
journalAt: Proceedings of the Denver Museum of Natural History, Series 3, 12 By: Johnson K. R.
journalAt: Annals and Magazine of Natural History, 12, 74 By: Mantell G. A.
journalAt: Proceedings of the United States National Museum, 15, 918 By: Fontaine W.
journalAt: Transactions of the Geological Society London, Ser. 2, 1, 2 By: Stokes C., Webb P. B.