 |
| |||
| board-and-pillar work; bord-and-pillar work; breast-and-pillar work; breast-and-pillar; room-and-rance (с нарезкой узких столбов) | |||
| камерно-столбовая выемка: 14 phrases, 2 sujets |
| Exploitation minière | 13 |
| Pétrole / pétrole | 1 |
|
| |||
| board-and-pillar work; bord-and-pillar work; breast-and-pillar work; breast-and-pillar; room-and-rance (с нарезкой узких столбов) | |||
| камерно-столбовая выемка: 14 phrases, 2 sujets |
| Exploitation minière | 13 |
| Pétrole / pétrole | 1 |