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| steeply pitching seam; steeply pitching coal (падение свыше 15-20 град. или свыше 30 град.) | |||
| steeply pitching coal | |||
| edge coal (с падением более 30°); pitch coal; pitching coal | |||
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крутопадающий угольный пласт : 4 phrases in 2 subjects |
| Gas processing plants | 3 |
| Geology | 1 |
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