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MSHA Handbook Series <br />U.S. Department of Labor <br />Mine Safety and Health Administration <br />Coal Mine Safety and Health <br />May 1992 <br />' Handbook Number PH92-V-6 <br />Mine Ventilation Plan <br />' Approval Procedures <br />II <br />~~ <br />1 <br /> <br /> <br /> <br /> <br />1 <br />1 <br /> <br />