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система коротких столбов stresses
mining.	narrow working (Йоркшир, Англия); pillar-and-bord method; pillar-and-bord system; pillar-and-stall method; pillar-and-stall system; pillar-and-stall; post-and-stall method; post-and-stall system; post-and-stall

система коротких столбов: 13 phrases in 2 subjects

Mining	12
Technology	1