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4Published 1975Subjects: “...Chemicals Safety measures....”
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6Published 1987Subjects: “...National Institute for Occupational Safety and Health Periodicals....”
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7Published 1997Subjects: “...Industrial safety Research United States....”
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8Published 2000Subjects: “...Industrial safety United States Statistics Periodicals....”
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Scroll down to title "Coal Contractor Mining Facts"
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