Patterson, K B; Hickson. A O <br/><br/>
Plane trigonometry 

 -  F S Crofts & Co., New York  1936 
 - 75 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry; Mathematics
<br/><br/><label>Dewey Class. No.: </label>516.24  PAT-P