%0 PDF %T Slides to Philosophy 167: Class 9 -- Descartes' Principia: The Vortex Theory of the Heavens -- Part 1. %A Smith, George E. (George Edwin), 1938- %D 2015-09-02T14:15:19.783Z %8 2015-09-02 %I Tufts Archival Research Center %R http://localhost/files/mw22vh99z %X Generally corresponds to the video segment: Class 9, Part 1. %G eng %[ 2018-10-08 %9 Text %~ Tufts Digital Library %W Institution