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| битуминозный уголь | |||
| ископаемый уголь | |||
| каменный уголь | |||
| pit coal: 22 phrases in 7 subjects |
| Coal | 3 |
| Ecology | 1 |
| General | 8 |
| Geology | 2 |
| Makarov | 2 |
| Technology | 3 |
| Thermal engineering | 3 |
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