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1SerialPublished 1978“…United States. Mine Safety and Health Administration…”
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2SerialPublished 1979“…United States. Mine Safety and Health Administration…”
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3SerialPublished 1979“…United States. Mine Safety and Health Administration…”
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4Government Document Bookby Schlick, Donald P.“…United States. Mine Safety and Health Administration…”
Published 1978
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5Government Document Serial“…United States. Mine Safety and Health Administration…”
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6SerialPublished 1979“…United States. Mine Safety and Health Administration…”
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7Government Document SerialPublished 1952“…United States. Mine Safety and Health Administration…”
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8Conference Proceeding“…United States. Mine Safety and Health Administration…”
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9Conference Proceeding BookPublished 1981“…United states. Mine Safety and Health Administration…”