Manufactura de productos de concreto y piedra.  Manufacture of concrete and stone products... 

 - [San Juan, P.R.]  División de Análisis de Salarios y Estudios Ocupacionales  19- 
 - v.  tables. 
<br/><br/> With appedncies and explantory notes.  Part of text in Egnlish. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Concrete products.<br/>Stone industry and trade.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico