exploitation par tranches
| horizontales
| exploitation par tranches | |
| construct. | slicing |
| horizontal | |
| arts. | horizontal |
| tech. | aclinal |
| horizontale | |
| construct. | isohypse; contour |
| |||
| slicing | |||
| bench and bench | |||
|
exploitation par tranches : 10 phrases in 3 subjects |
| Construction | 1 |
| General | 1 |
| Metallurgy | 8 |