@book{257218,
	author = {Geological Survey (U.S.)  },
	title = {Cretaceous and Lower Tertiary Stratigraphy in west-central Puerto Rico},
	publisher = {U.S. Govt. Print. Off},
	year = {1967},
	address = {Washington},
	note = {Prepared in cooperation with the commonwealth of Puerto Rico Economic Development Administration, Industrial Research Department."  }
}