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SPEEDY BACKFILLING FOR OLD MINES - Pneumatic equipment can help fill the underground voids left by thousands of abandoned coal mines.
SPEEDY BACKFILLING FOR OLD MINES - Pneumatic equipment can help fill the underground voids left by thousands of abandoned coal mines.
SPEEDY BACKFILLING FOR OLD MINES - Pneumatic equipment can help fill the underground voids left by thousands of abandoned coal mines.
Dyni, Robert C. (author) / Burnett, Mackenzie
Civil engineering ; 63
1993
Article (Journal)
English
Pneumatic equipment can help fill the underground voids left by thousands of abandoned coal mines
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