Descartes, René,  1596-1650 <br/><br/>
Selections from the Principles of Philosophy  [electronic resource] / 
René Descartes 
 -  Project Gutenberg,  2003 
 - Project Gutenberg  4391 .
<br/><br/> Public domain in the USA. 
<br/><br/>Electronic text 
<br/><br/><label>Subjects--Index Terms: </label>Philosophy 
<br/><br/><label>LC Class. No.: </label>B