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working the broken
The extraction of coal pillars in a pillar method of mining.
- Kalbos dalis: noun
- Pramonės šaka / sritis: Mining
- Category: General mining; Mineral mining
- Government Agency: USBM
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Kūrėjas
- ed.young
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(V.I.P) 21084 points - 100% positive feedback
(Milwaukee, United States)
