A pollution study of Portugues River 
by [Rafael Muñoz Candelario. 
 - Mayagüez, P.R.]  1969. 
 - 36 p.  charts. 
<br/><br/> Mimeographed. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Pollution.<br/>Rivers--Puerto Rico
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Portugues River, Puerto Rico.