@book{110956,
	author = {United States and Crooks, James W.},
	title = {Water resources of the Guayanilla-Yauco area, Puerto Rico},
	year = {1968.},
	series = {Water Resources Bulletin},
	address = {Puerto Rico},
	note = {Prepared by the United State Geological Survey in cooperation with Puerto Rico Legislatiave Assembly, Puerto Rico Water Resources Aauthority, Puerto Rico Aqueduct & Sewer Authority and Puerto Rico Industrial Development Company.}
}