Vance, Elbridge Putman,  1915-,  <br/><br/>Trigonometry / By System Technology Institute Incorporated.  - Manila:  System Technology Institute Incorporated,  [1997]  ©1997  - i,144 pages:  illustrated,  25.4 cm. <br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry.<br/><br/><label>LC Class. No.: </label>QA 531  / T734 1997