@book{142176,
	author = {United States},
	title = {Population profile of the United States.},
	publisher = {Bureau of the Census},
	year = {1993- .},
	series = {Current population reports. Special studies.},
	address = {[Washington, D.C.]},
	note = {Decription based on 1993 report.},
	url = {http://www.census.gov/prod/2001pubs/p23-205.pdf}
}