El crisol :  bimestrario del Colegio de Químicos de Puerto Rico.  

 - Hato Rey, P.R.  1953- 
 - volumes :  illustrations (black and white) ;  22 cm.  
 - B-monthly 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemistry--Puerto Rico
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico--Periodicals.