@book{219112,
	author = {United States},
	title = {Earnings and employment data for workers covered under social security, by state and county},
	publisher = {Social Security Administration, Office of Research, Evaluation, and Statistics},
	year = {1997-},
	address = {Washington, D.C.},
	url = {http://purl.access.gpo.gov/GPO/LPS53463}
}