Conde-Costas, Carlos. <br/><br/>
Assessment of nitrate contamination of the upper aquifer in the Manatí-Vega Baja area, Puerto Rico 
by Carlos Conde-Costas and Fernando Gómez-Gómez ; in cooperation with the Puerto Rico Environmental Quality Board. 
 - San Juan, P.R.  Denver, CO  U.S. Dept. of the Interior, U.S. Geological Survey  Branch of Information Services [distributor]  1999. 
 - v, 43 p.  ill. (some col.), maps (some col.)  28 cm. 
 - Water resources investigations report  99-4040 .
<br/><br/> Shipping list no.: 99-0235-P. 
<br/><br/>Includes bibliographical references (p. 36-38). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Groundwater--Pollution--Puerto Rico--Manatí Region.<br/>Nitrates--Environmental aspects--Puerto Rico--Vega Baja Region.<br/>Nitrates--Environmental aspects--Puerto Rico--Manatí Region.<br/>Groundwater--Pollution--Puerto Rico--Vega Baja Region.
<br/><br/><label>LC Class. No.: </label>QE75  / .W3 99-4040 
<br/><br/><label>National Agricultural Library Call No.: </label>GB701.W375  / no.99-4040 
<br/><br/><label>GPO Item No.: </label>0624-B 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.42/4:99-4040