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Characterization of the 1986 metallic mining workforce

Published: Pittsburgh, PA : U.S. Dept. of the Interior, Bureau of Mines, 1988
Format: Microform, Microfiche
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Characterization of the 1986 sand and gravel mining workforce

Published: Pittsburgh, PA : U.S. Dept. of the Interior, Bureau of Mines, 1988
Format: Microform, Microfiche
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