Porter, Dot2023-05-232014-05-212014-05-012014-05-21https://repository.upenn.edu/handle/20.500.14332/46873http://hdl.library.upenn.edu/1017/d/medren/4746981youtubemedieval manuscriptsHistory of Science, Technology, and MedicineMedieval StudiesOther Arts and HumanitiesOther Physical Sciences and MathematicsPenn Library's LJS 23 - De natura rerum (Video Orientation)Media