Rodríguez, José M. <br/><br/>
Ground-water quality in the Caguas-Juncos Valley, Puerto Rico, April to October, 1990 
 Ground water quality in the Caguas-Juncos Valley, Puerto Rico, April to October, 1990 
by José M. Rodríguez and Juan C. Puig ; prepared in cooperation with the Puerto Rico Aqueduct and Sewer Authority. 
 - San Juan, P.R.  Denver, CO  U.S. Geological Survey  Earth Science Information Center  1996. 
 - iv, 15 p.  ill.  28 cm. 
 - U.S. Geological Survey open-file report  96-139 .
<br/><br/>Includes bibliographical references (p. 15). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Groundwater--Quality.--Puerto Rico--Caguas Region<br/>Groundwater--Quality.--Puerto Rico--Juncos Region<br/>Groundwater--Quality.--Puerto Rico--Gurabo Region