"Archived copy". www.ballparkwatch.com. Archived from the original on 27 September 2007. Retrieved 12 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
books.google.com
Henry Wharton Shoemaker (1919). Extinct Pennsylvania Animals. Altoona Tribune Publishing Company. p. 15. Retrieved 18 March 2013.
Pennsylvania. Superior Court; Wilson Conrad Kress; Edward Pease Allinson; William Irwin Schaffer; Albert Barnes Weimer; Spencer Gilbert Nauman (1900). Pennsylvania Superior Court Reports. Banks & Bros. pp. 354–. Retrieved 18 March 2013.
"Archived copy". www.ballparkwatch.com. Archived from the original on 27 September 2007. Retrieved 12 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)