Freudenthal, Hans <br/><br/>
Mathematics observed. 
Translated from the German by Stephen Rudolfer and I. N. Baker. 
 - New York  McGraw-Hill  [c1967] 
 - 256 p.  illus.  20 cm. 
 - World university library .
<br/><br/><label>LCCN: </label>65023826  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Popular works.
<br/><br/><label>LC Class. No.: </label>QA93  / .F6813 1967b 
<br/><br/><label>Dewey Class. No.: </label>510