Porter, Dot2023-05-232015-10-132015-10-012015-10-13https://repository.upenn.edu/handle/20.500.14332/46918http://hdl.library.upenn.edu/1017/d/medren/5877833youtubeMedieval StudiesOther Arts and HumanitiesPenn Library's LJS 172 Tabulae directionum et profectionum (Video Orientation)Media