Hobson, E. W. <br/><br/>
A Treatise on plane trigonometry /  
E. W. Hobson. 
 - 7a ed. 
 - [S.l.] :   Cambridge University Press,  1928. 
 - 383 p.  
<br/><br/><label>Subjects--Topical Terms: </label>--GEOMETRIA
<br/><br/><label>Universal Decimal Class. No.: </label>514