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| тонкий угольный пласт | |||
| тонкий пласт угля | |||
| low coal: 69 phrases in 11 subjects |
| Coal | 2 |
| Ecology | 1 |
| Electronics | 1 |
| Energy industry | 17 |
| Gas processing plants | 8 |
| Geology | 5 |
| Makarov | 8 |
| Metallurgy | 2 |
| Mining | 5 |
| Technology | 17 |
| Thermal engineering | 3 |
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