Russell, Bertrand <br/><br/>
Our Knowledge of the External World : as a field for scientific method in philosophy   

 - 2nd ed. 
 - London  George Allen & Unwin Ltd.  1949. 
 - 251 p. 
 -   .
<br/><br/><label>ISBN: </label>
<br/><br/><label>Dewey Class. No.: </label>RBC 120  / R961