- Philadelphia: University of Pennsylvania Press, 1944.
- cloth, dust jacket.
- xiv, 170 pages.
Price: $50.00 other currencies
Order Nr. 65796
B1-711. First edition. With a number of illustrations including one by John Swientochowski. Information on Dr. Joseph Leidy, Francis Jordan, Hilborne Cresson and John Wigglesworth. Only minor jacket wear. well-preserved copy..