Hobson, E W <br/><br/>
Treatise on plane and advanced trigonometry 

 - 7th ed. 
 - New York  Dover  1928 
 - xv,383p.   
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<br/><br/><label>ISBN: </label>
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<br/><br/><label>Subjects--Index Terms: </label>plane trigonometry  Trigonometry 
<br/><br/><label>Dewey Class. No.: </label>514.1