Heckenbach, Alan J. <br/><br/>
Elementary functions  an approach to precalculus mathematics 
[by] Alan J. Heckenbach [and] J. Colby Kegley. 
 - [New York]  Macmillan  [1970] 
 - xi, 356 p.  illus. (part col.)  23 cm. 
<br/><br/><label>LCCN: </label>70084438  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Functions
<br/><br/><label>LC Class. No.: </label>QA331.3  / .H4 
<br/><br/><label>Dewey Class. No.: </label>517