@book{110496,
	author = {Darling, Daniel H. and Ray, Robert S. and Puerto Rico.},
	title = {Manufacturing occupations in Puerto Rico},
	publisher = {University of Puerto Rico Press},
	year = {1954.},
	address = {[Río Piedras, P.R.]},
	note = {At head of title : A Social Science Research Center study. College of Social Sciences. University of Puerto Rico.}
}