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5 results returnedSearch results
- Anthracite mechanical-mining investigations :second testing of Brieden pneumatic packing machine
- Microfilming maps of abandoned anthracite mines :mines of the eastern middle field
- Three mine fire control projects in northeastern Pennsylvania
- Pumped-slurry backfilling of inaccessible mine workings for subsidence control
- Pumped-slurry backfilling of abandoned coal mine workings for subsidence control at Rock Springs, Wyo.
