@techreport{NBERw12984,
 title = "The Race between Education and Technology: The Evolution of U.S. Educational Wage Differentials, 1890 to 2005",
 author = "Claudia Goldin and Lawrence F. Katz",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "12984",
 year = "2007",
 month = "March",
 URL = "http://www.nber.org/papers/w12984",
}