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Economic Gains from Educational Reform by US States. (with Jens Ruhose and Ludger Woessmann). Journal of Human Capital [forthcoming]; Originally released as NBER Working Paper No. 21770, Cambridge, MA: National Bureau of Economic Research, Revised July 2017.
The Market for Teacher Quality. (with John F. Kain, Daniel M. O'Brien, and Steven G. Rivkin)
. NBER Working Paper 11154, National Bureau of Economic Research, February 2005.