CROWDER, Norman A. MARTIN, G.C. <br/><br/>
TRIGONOMETRY : A FIRST COURSE 

 -  English Universities Press Limited, London   1968 
<br/><br/><label>ISBN: </label>0 340 04926 X 
<br/><br/><label>Dewey Class. No.: </label>516.24  / CRO/T