Horner, Donald R <br/><br/>
Trigonometry  a study of certain real functions 
by Donald R. Horner 
 - Rinehart and Winston, New York  Holt  1968 
 - xiii, 303 p. : ill. ; 24 cm. 
<br/><br/><label>LCCN: </label>68-016787 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry, Plane