1889 Leidy J. Notice and description of fossils in caves and crevices of the limestone rocks of Pennsylvania. [Note et description des fossiles des grottes et crevasses des calcaires de Pennsylvanie]. Ann. Report Geol. Surv. Penn. for 1887, 1-20, with pls.
1852 Leidy Joseph Descr. of the remains of Extinct Mammalia and Chelonia from Neb. Terr., Coll. during the Geol. Survey under the direction of Dr. David Dale Owen. Rept. of a Geol. Sur. of Wisconsin, Iowa, and Minn. and incidentally a Portion of Nebraska Territory by David Dale Owen, United States Geologist, Phil.