Coal miner “tamping” a charge after having already drilled the hole and set the explosive charge, c. 1930. (Source: loc.gov)

Coal miner "tamping" a charge after having already drilled the hole and set the explosive charge, c. 1930. (Source: loc.gov)

Coal miner “tamping” a charge after having already drilled the hole and set the explosive charge, c. 1930. (Source: loc.gov)

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