Beltran Yu, Romer F., <br/><br/>
Development and Validation of Learning  Resources in Mathematics 9 / 
Romer F. Beltran Yu. 
 - 150 leaves : 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Dewey Class. No.: </label>510 MAED  / B453d