Russell, Bertrand,  1872-1970. <br/><br/>
Our knowledge of the external world / 
Bertrand Russell 
 - New York :  A Mentor Book,  1929 
 - vii, 191 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Philosophy.<br/>Filosofía
<br/><br/><label>LC Class. No.: </label>B 1649  / R961o 1929