Rodríguez-Martínez, Jesús.      <br/><br/>
Detection of conduit-controlled ground-water flow in northwestern Puerto Rico using aerial photograph interpretation and geophysical methods 
by Jesús Rodríguez-Martínez, and Ronald T. Richards ; in cooperation with the Puerto Rico Aqueduct and Sewer Authority.      
 - San Juan, P.R.  Denver, CO  U.S. Dept. of the Interior, U.S. Geological Survey  Branch of Information Services [distributor]  2000.      
 - v, 45 p.  ill., maps (some col.)  28 cm.      
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Groundwater flow--Puerto Rico.<br/>Aerial photography in hydrogeology--Puerto Rico.<br/>Geophysics--Puerto Rico.<br/>Karst--Puerto Rico.     
<br/><br/><label>Dewey Class. No.: </label>553.79  / R6961d