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You searched for: Date undated Remove constraint Date: undated Topical Subjects Coal-mining machinery. Remove constraint Topical Subjects: Coal-mining machinery. Topical Subjects Coal Mines and Mining--Miners at Work. Remove constraint Topical Subjects: Coal Mines and Mining--Miners at Work. Topical Subjects Coal mines and mining. Remove constraint Topical Subjects: Coal mines and mining.
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Two miners work with a machine to undercut coal.
Miner running a continuous mining machine.