At: Second Geological Survey of Pennsylvania Report of Progress, 1880, P, 1 By: Lesquereux L. C.
journalAt: Second Geological Survey of Pennsylvania Report of Progress, 1880, P, 2 By: Lesquereux L. C.
journalAt: Second Geological Survey of Pennsylvania Report of Progress, 1884, P, 3 By: Lesquereux L. C.
journalAt: Documenta naturae, 115 By: Fischer T. C., Butzmann R.
bookAt: Geol. Penns., Edinburgh and London; Philadelphia, W. Blackwood and sons [Edinburgh and London]; J.B. Lippincott & Co. [Philadelphia], 1858, 2, 2 By: Lesquereux L. C.
journalAt: Edinburgh new philosophical journal, 7, July-October By: Lindley J.
journalAt: Journal of the Cincinnati Society of Natural History, 2, 2 By: Miller S. A.
journalAt: Bulletin of the Torrey Botanical Club, 38, 8 By: Knowlton F. H.
journalAt: Journal of the Cincinnati Society of Natural History, 5, 1 By: Miller S. A.
journalAt: Transactions and Proceedings of the Geological Society of South Africa, 55, Transactions By: Plumstead E. P.