Hall, H.S Knight, S R <br/><br/>
Elementary Trigonometry 

 - London  Macmillan & Co  1962 
 - p.443 
<br/><br/><label>Subjects--Topical Terms: </label> Logarithms  Geometrical Proofs  Miscellaneous Transformations 
<br/><br/><label>Dewey Class. No.: </label>514 H174E