De Lemon, Rosalie F. <br/><br/>
Development and acceptability of worktext in plane trigonometry 

 - Morong, Rizal  [publisher not identified]  2009 
 - 85 pages ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching -- Aids and devices.<br/>Plane trigonometry.
<br/><br/><label>Dewey Class. No.: </label>371.33  / D37