| |||
roof rock (угольного пласта) | |||
backs | |||
roof strata | |||
top covers | |||
| |||
roof rock | |||
top covers; top rock | |||
rock cover; top cover |
породы кровли : 46 phrases in 9 subjects |
Energy industry | 2 |
Gas processing plants | 15 |
Geology | 5 |
Geophysics | 4 |
Makarov | 2 |
Mining | 14 |
Oil / petroleum | 2 |
Seismology | 1 |
Technology | 1 |