@book{191433,
	author = {U.S. Census Bureau.},
	title = {Puerto Rico,1990.},
	publisher = {U.S. Dept. of Commerce, Economics and Statistics Administration, U.S. Census Bureau},
	year = {[1991]},
	address = {[Washington, D.C.]},
	note = {Parallel texts in English and Spanish, bound together back-to-bak and inverted, each with its own title page.}
}