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Anthracite Mine Certification Records for Foremen and Assistant Foremen, 1886-1968
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Environmental Protection, Department of (DEP)
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Department of Environmental Protection
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[Series RG-066-II-1] Anthracite Mine Certification Records for Foremen and Assistant Foremen 1886-1968
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Anthracite coal mines and mining
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Occupations--Certification
29
Pennsylvania. Department of Environmental Protection
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