National center for educational research and development <br/><br/>
Chemistry: Pedagogical guide, specimen collection orbitales secondary education first year  

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