@book{199336,
	author = {Rodríguez-Martínez, J., Santiago-Rivera, Luis et al. and Geological Survey (U.S.)  },
	title = {Surface-water, water-quality, and ground-water assessment of the municipio of Ponce, Puerto Rico, 2002-2004},
	publisher = {U.S. Dept. of the Interior, U.S. Geological Survey},
	year = {2006},
	series = {U.S. Geological Survey scientific investigations report},
	address = {Reston, Va.}
}