Lock, J.B.. <br/><br/>
A Treatise on Elementary Trigonometry /  Textual Documents 
J.B.Lock. 
 - 1st ed. / 
 - New York :  Macmillan and co ,  1901. 
 - 306p. ;  18cm. 
<br/><br/><label>Subjects--Index Terms: </label>Trigonometry Elementary Trigonometry G-Mathematics 
<br/><br/><label>Dewey Class. No.: </label>514  / L 789 T