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столбовая выемка stresses
geol.	pillar-and-panel work
goldmin.	pillar-and-panel post work (Leonid Dzhepko); board-and-pillarwork (Leonid Dzhepko); breast-and-pillar work (Leonid Dzhepko)
mining.	long-pillar work; board-and-pillar work; bord-and-pillar work; pillar-and-post work; pillar-and-stall working

столбовая выемка: 56 phrases in 5 subjects

Geology	1
Gold mining	2
Mining	50
Oil / petroleum	2
Technology	1