The comprehensive water quality management plan for Puerto Rico, 1970-2020. 

 - [Santurce, P.R.]  Environmental Quality Board  [1976] 
 - iv. (various pagings)  maps, charts. 
<br/><br/> Mimeographed.  Errata sheet included. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Puerto Rico.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico--Water--Quality.