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1Published 1935Subjects: “...Coal-mining machinery Law and legislation United States....”
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2Published 1981Subjects: “...Coal-mining machinery Noise....”
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3Published 2011Subjects: “...Coal-mining machinery Safety regulations United States....”
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4Published 2011Subjects: “...Coal-mining machinery Safety regulations United States....”
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5Published 2011Subjects: “...Coal-mining machinery Safety regulations United States....”
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6Published 2011Subjects: “...Coal-mining machinery Safety regulations United States....”
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7Published 2011Subjects: “...Coal-mining machinery Safety regulations United States....”
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8Published 2011Subjects: “...Coal-mining machinery Safety regulations United States....”
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9Published 1935Subjects: “...Coal-mining machinery Law and legislation United States....”
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10Published 2012Subjects: “...Coal-mining machinery Safety regulations United States....”
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11by Hotchkiss, Willard E. (Willard Eugene), 1874-1956Subjects: “...Coal-mining machinery United States....”
Published 1940
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12by Dix, KeithSubjects: “...Coal-mining machinery Social aspects United States History 20th century....”
Published 1988
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13by Christofferson, DonaldSubjects: “...Coal-mining machinery Technological innovations....”
Published 1983
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14Published 2011Subjects: “...Coal-mining machinery United States Safety measures....”
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15Published 2011Subjects: “...Coal-mining machinery Safety regulations United States....”
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16Published 2006Subjects: “...Coal-mining machinery United States Safety measures....”
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17Published 2009Subjects: “...Coal-mining machinery United States Noise Safety measures Cost effectiveness....”
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