Guzmán Ríos, Senén <br/><br/>
Hydrology and water quality of the principal springs in Puerto Rico 
by Senén Guzmán-Ríos. 
 - San Juan, P.R.  Geological Survey  1988. 
 - v, 30 p.  ill., maps. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water quality--Measurement.--Puerto Rico<br/>Springs--Puerto Rico.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico--Water.