Wittgenstein, Ludwig,  1889-1951. <br/><br/>
Preliminary studies for the "Philosophical investigations,"  generally known as the Blue and Brown books. 

 - [2d ed.] 
 - New York,  Barnes & Noble,  2008 
 - xiv, 192 p.  23 cm. 
<br/><br/><label>LCCN: </label>71004773  
<br/><br/><label>LC Class. No.: </label>B3376.W563  / P6 1969b 
<br/><br/><label>Dewey Class. No.: </label>149.94