@book{192176,
	author = {Conde-Costas, Carlos. and Gomez-Gomez, Fernando. and Junta de Calidad Ambiental de Puerto Rico.},
	title = {Assessment of nitrate contamination of the upper aquifer in the Manatí-Vega Baja area, Puerto Rico},
	publisher = {U.S. Dept. of the Interior, U.S. Geological Survey},
	year = {1999.},
	series = {Water resources investigations report},
	address = {San Juan, P.R.},
	note = {Shipping list no.: 99-0235-P.}
}