Bituminous Mine Certification Records for Second Grade Foremen, 1903-1963

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  • Date = 1918-1922

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Pennsylvania. Department of Mines and Mineral Industries, Bituminous coal industry, Foremen--Certification
Department of Mines and Mineral Industries, Bituminous Mine Certification Records for Second Grade Foremen, Volume 4, Numbers 1,501-2,000, 1918-1922.