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1 <br />PREFACE <br /> <br />This handbook sets forth guidelines and instructions for evaluating and processing mine <br />ventilation plans. The instructions are primarily procedural and are intended to serve as an t <br />organizational aid for all MSHA coal enforcement personnel. <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br />1 <br />1 <br /> <br /> <br /> <br /> <br />L <br /> <br />