Abbott, P. (Percival), 1869-  Abbott, P. (Percival), 1869- <br/><br/>
Teach yourself trigonometry / 
by P. Abbott. 
 - London :  English University Press,  [1967] 
<br/><br/> First published in 1940. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plane trigonometry.