 |
| |||
| medium formation (категория буримости) | |||
| intermediate rock; neutral rock | |||
| |||
| medium rock | |||
| средняя порода: 35 phrases in 14 subjects |
| Agriculture | 5 |
| Animal husbandry | 1 |
| Drilling | 5 |
| Geology | 4 |
| Gold mining | 1 |
| Makarov | 2 |
| Mining | 1 |
| Oil / petroleum | 6 |
| Oil and gas technology | 3 |
| Oilfields | 3 |
| Petrography | 1 |
| Sakhalin | 1 |
| Sakhalin R | 1 |
| Technology | 1 |