Selby Samuel <br/><br/>
Sets-relations-functions. 
Selby Samuel; Sweet Leonard 
 - 2 
 -  1969 
<br/><br/><label>Standard No.: </label>93464 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B31, K9