Henle,Michael <br/><br/>
A combinatorial introduction to topology / 
Henle,Michael. 
 - San Francisco:  W.H.Freeman,  1979. 
 - xiv,310p;25cm 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0716700832 
<br/><br/><label>Dewey Class. No.: </label>514.2 HEN