Bell, Grdon L. <br/><br/>
Graphs for interpretation / 
Grdon L. Bell 
 - London :  Harrap ,  1960 
 - 91p. :  ill.  ;  22 cm.  
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>510  / BEL 3