@book{188603,
	author = {Renken, Robert A.},
	title = {Geology and hydrogeology of the Caribbean Islands aquifer system of the Commonwealth of Puerto Rico and the U.S. Virgin Islands},
	publisher = {U.S. Geological Survey},
	year = {2002.},
	series = {U.S. Geological Survey professional paper},
	address = {Boulder, Colo.}
}