 |
| |||
| board-and-pillar mining; pillar method | |||
| room and pillar mining (угля) | |||
| bord-and-pillar mining; room and pillar mining; room-and-pillar mining | |||
| камерно-столбовая разработка: 58 do fraz, 5 tematyki |
| Geologia | 1 |
| Górnictwo | 48 |
| Olej i gaz | 1 |
| Technika i technologia | 6 |
| Wydobywanie złota | 2 |