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9Boal,William M."The Effect of Unionism on Accidents in Coal Mining,1897-1929.[M]" Working Paper,Des Moines,IA:College of Business and Public Administration,Drake University,2003.
10Kniesner,T.J.and Leeth,J.D.“Data Mining Mining Data:MSHA Enforcement Efforts,Underground Coal Mine Safety,and New Health Policy Implications.”[J]The Journal of Riskand Uncertainty,2004,29(2):83 -111.