Porter, Dot2023-05-232014-05-212014-05-012014-05-21https://repository.upenn.edu/handle/20.500.14332/46883http://hdl.library.upenn.edu/1017/d/medren/4646348youtubemedieval manuscriptsMathematicsMedieval StudiesOther Arts and HumanitiesPenn Library's LJS 26 - Algorismus, Tractatum de sphaera. (Video Orientation)Media