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"The miner is using a compressed-air drill to drive a hole in the lower edge of the working face of the coal vein."

7. Mining Bituminous Coal, Pa.

IDNO:
052810
Title:
Mining Bituminous Coal, Pa.
Date:
undated
Description:
"The miner is using a compressed-air drill to drive a hole in the lower edge of the working face of the coal vein."