Freudenthal, Hans <br/><br/>
Mathematics observed 

 - London:  World University Library,  1967. 
 - 256p.:  ill.;  20cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics<br/>Popular works
<br/><br/><label>LC Class. No.: </label>QA93.F6813