Hobson E W <br/><br/>
Tratise on plane trigonometry 

 -  1939 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>24103 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B5, G9