National center for educational research and development <br/><br/>
Building up mathematics: Pedagogical guide secondary education first year  (specimen) 

 - Sin El Fil  National center for educational research and development  1998 
 -  134 p.  30 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Math -- Study and teaching (Secondary Grade 10) -- Pedagogical guide
<br/><br/><label>Dewey Class. No.: </label>CRDP 373.7 Math. Guide Gr.10