@book{110285,
	author = {Cox, Dennis P.},
	title = {Geology of the Tanamá and Helecho porphyry copper deposits and vicinity, Puerto Rico},
	publisher = {U.S. G.P.O.},
	year = {1985.},
	series = {U.S. Geological Survey professional paper},
	address = {Washington},
	note = {One map on folded leaf in pocket.}
}