Torres González, Sigfredo. <br/><br/>
Compilation of ground-water level measurements obtained by the United States Geological Survey in Puerto Rico, 1958-1985 
by Sigfredo Torres-González. 
 - San Juan, P.R.  Department of the Interior  1991. 
 - vi, 163 p.  maps, tables  28 cm. 
<br/><br/>Bibliography: p. 162-163. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Groundwater--Puerto Rico.<br/>Groundwater--Measurement.