@book{257997,
	author = {United States},
	title = {1980 census of population.},
	publisher = {U.S. Dept. pf Commerce, Boreau of the Census,},
	year = {[1982]},
	address = {Washington :},
	note = {Parts for Puerto Rico, also issues in Spanish with title: 1980 censo de poblacion. Volumen 1, Caracteristicas de la poblacion.}
}