Plane trigonometry: : simplified and integrated/ 
Reyes, Edgardo A. 
 -  National Book store,  1963 
 - xii, 241 p. ;. 
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<br/><br/><label>ISBN: </label>9-71080783-8 
<br/><br/><label>Dewey Class. No.: </label>F 516.24 R33p 1963