Porter, Dot2023-05-232014-08-012014-07-012014-08-01https://repository.upenn.edu/handle/20.500.14332/46877http://hdl.library.upenn.edu/1017/d/medren/4809379youtubeHistoryMedieval StudiesOther Arts and HumanitiesPenn Library's LJS 64 - Novae theoricae planetarum (Video Orientation)Media