Ward, Porter Elwood <br/><br/>
Water wells in Puerto Rico 
by P. E. Ward and L. S. Truxes ; prepared by the United States Geological Survey in cooperation with The Legislative Assembly of Puerto Rico...[et al.] 
 - Washington, D. C.  U. S. Geological Survey  1964. 
 - 248 p.  ill. 
 - Water-Resources Bulletin, no. 3 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water, Under ground--Puerto Rico.