Russell, Bertrand <br/><br/>
Our knowledge of the external world. 

 - London:  George Allen & Unwin,     1922. 
 - 251p.  cm. 
<br/><br/><label>ISBN: </label>041210085 
<br/><br/><label>Dewey Class. No.: </label>RxM72,EW  F2;1