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

 - 2nd ed. 
 - Oxford,  Blackwell,  1969. 
 - xv, 192 p.  illus.  23 cm. 
<br/><br/><label>ISBN: </label>063111890X 
<br/><br/><label>Nat. Bib. No.: </label>B69-10384 
<br/><br/><label>LC Class. No.: </label>B3376.W563  / P6 1969 
<br/><br/><label>Dewey Class. No.: </label>149/.94