Raņa, Elisher A. <br/><br/>
The ER device:  an instructional material/ 
Elisher A. Raņa. 
 - Philippines:  In the Grade School, Inc.,  c2010-2011. 
 - v59 n4, page 160:  illustrations;  28 cm. 
<br/><br/><label>ISSN: </label>2094-8042 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics.
<br/><br/><label>Dewey Class. No.: </label>DPer 370.105 M72 June 2010-Mar 2011 v. 59 n. 1-10