@techreport{NBERr1209,
 title = "The Evolution of Unemployment in the United States:  1968-1985",
 author = "Kevin M. Murphy and Robert H. Topel",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Reprint Series",
 number = "1209",
 year = "1989",
 month = "June",
 URL = "http://www.nber.org/papers/r1209",
 abstract = {},
}