3Boal William M.The Effect of Unionism on Accidents in CoalMining,1897-1929[M].Working Paper,Des Moines,IA:College of Business and Public Administration,DrakeUniversity,2003.
4Kniesner,T.J.and Leeth,J.D.Data Mining Mining Data:MSHA Enforcement Efforts,Underground Coal Mine Safety,andNew Health Policy Implications[J].The Journal of Risk andUncertainty,2004,29(2):83～111.
5Scholz,J.T.and Gray,W.B.OSHA Enforcement and Workplace Injuries:A Behavioral Approach to Risk Assessment[J].Journal of Risk and Uncertainty,1990,3(3):283～305.
