Hobson, E. W. <br/><br/>
Treatise on plane and advanced trigonometry 
E. W. Hobson 
 - 7th ed. 
 - New York  Dover publications  1928 
 - 383p. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>516.242  / H684