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3 results returnedMechanical mining in some bituminous-coal mines.
Mechanical mining in some bituminous-coal mines.
Packaged-fuel plants in the United States that reported production in 1956
Published Year
Subject
- Bituminous coal industry--United States (3) *
- Coal-mining machinery (2)
- Briquets (Fuel) industry--United States--Statistics (1)
Author
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