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1Published 1965Subjects: “...Coal mines and mining Safety regulations United States....”
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2Published 1971Subjects: “...Coal mines and mining Safety regulations United States....”
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3Published 1969Subjects: “...Coal mines and mining Safety regulations United States....”
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4Published 1969Subjects: “...Coal mines and mining Safety regulations United States....”
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5Published 1969Subjects: “...Coal mines and mining Safety regulations United States....”
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6Published 1969Subjects: “...Coal mines and mining Safety regulations United States....”
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7Published 1972Subjects: “...Coal mines and mining Safety regulations United States....”
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8Published 1959Subjects: “...United States. Commission on Coal Mine Safety....”
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9Published 1975Subjects: “...United States. Federal Coal Mine Health and Safety Act of 1969....”
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10Published 1971Subjects: “...Coal mines and mining Safety regulations United States....”
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11Published 1958Subjects: “...Coal mines and mining Safety regulations United States....”
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12Published 1976Subjects: “...Coal miners United States....”
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13Published 1972Subjects: “...Coal miners Legal status, laws, etc. United States....”
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14Published 1972Subjects: “...Coal miners Legal status, laws, etc. United States....”
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