Green,J.A <br/><br/>
Sets and Groups 

 - London :  Routledge & Kegan Paul Ltd,  1965. 
 - 84 p.;  18 c m 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education
<br/><br/><label>Dewey Class. No.: </label>372.7  / GRE