Heckenbach Alan J <br/><br/>
Approach to precalculus mathematics 

 -  1970 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>21345 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B13, L03