Percious, Donald J. <br/><br/>
Submarine spring explorations  northwest coast of Puerto Rico 
by Donald J. Percious. 
 - Mayaguez, P.R.  Water Resources Research Institute, University of Puerto Rico, Mayaguez Campus, School of Engineering  [1971] 
 - 48 leaves  ill., maps, photos  28 cm. 
<br/><br/> "Final report"--Cover.  Supported in part by the U.S. Dept. of the Interior under the Water Resources Research Act of 1964, Public Law 88-379; project A-029-PR.  "November, 1971."  "March 1972"--Cover.  "UPRICO/WRRI/FR/71/29/1." 
<br/><br/>Bibliography: leaves 46-48. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Springs--Puerto Rico.<br/>Groundwater flow--Puerto Rico.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico