Underground injection control regulation. 

 - San Juan, P. R.  Environmental Quality Board  1983. 
 - 1 v. (various pagings),  ill. 
<br/><br/> Cover title. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water, Under ground--Purification.--Puerto Rico<br/>Water purification--Puerto Rico.<br/>Water quality--Puerto Rico.<br/>Water, Under ground--Quality.--Puerto Rico