Magnus, Wilhelm. Karrass, , Donald. <br/><br/>
Combinatorial group theory  presentation of groups in terms of generators and relations /by Wilhelm Magnus, Abraham Karrass, Donald S. 

 - New York  Interscience Publish  1966 
 - xii, 444p, incl bibl. & ind. 
 - Pure and Applied Mathematics  V.13, a Series of Texts and Monographs .
<br/><br/><label>Dewey Class. No.: </label>512.22  / N66