| |||
| coal-mining (bookworm); mining operations; coal extraction | |||
| coal extraction | |||
| coal mining | |||
| coal output; coal production | |||
|
угледобыча : 2 phrases in 2 subjects |
| Coal | 1 |
| Geology | 1 |
| |||
| coal-mining (bookworm); mining operations; coal extraction | |||
| coal extraction | |||
| coal mining | |||
| coal output; coal production | |||
|
угледобыча : 2 phrases in 2 subjects |
| Coal | 1 |
| Geology | 1 |