College algebra 
Hart, William L. 
 - Fourth edition. 
 -  D.C Health and Company.  1964 
 - 480 pages. 
<br/><br/>
<br/><br/><label>ISBN: </label>9-71081897-X 
<br/><br/><label>Dewey Class. No.: </label>512 H25c 1964