Rider, Paul R. <br/><br/>
Plane and spherical trigonometry / 
Paul R. Rider. 
 - N. Y :  The Macmillan,  c1971. 
 - xiv, 142 p. : ill. ; 21 cm. 
<br/><br/><label>ISBN: </label>9710819186 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry.