Boletín de avances técnicos / 
Centro de Información Técnica 
 - volumes ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science news.--Periodicals.<br/>Science and technology.--Periodicals.<br/>STEM (Education)--Periodicals. 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico--Periodicals.