Biodiversity Heritage Library
By "University of Pennsylvania. "
Animal locomotion : the Muybridge work at the University of Pennsylvania : the method and the result.
By: University of Pennsylvania.
Publication info: Philadelphia :J. B. Lippincott Co.,1888.
Holding Institution: Webster Family Library of Veterinary Medicine (archive.org)
An experimental dissertation on the rhus vernix, rhus radicans and rhus glabrum : commonly known in Pennsylvania by the names of poison-ash, poison-vine and common sumach /
By: Horsfield, Thomas, - Cist, Charles, - University of Pennsylvania.
Publication info: Philadelphia :Printed by Charles Cist, no. 104, North Second Street,MDCCXCVIII 
Holding Institution: National Library of Medicine (archive.org)
The science of animal locomotion (zoopraxography) : an electro-photographic investigation of consecutive phases of animal movements /
By: Muybridge, Eadweard, - University of Pennsylvania.
Publication info: Philadelphia :E. Muybridge,
Holding Institution: Boston Public Library (archive.org)