Filter by: Subject
Зараз показуються 1-10 з 1
| angle of occurrence (1) |
| argillite (1) |
| coal seam (1) |
| depth of development (1) |
| distance between layers (1) |
| roof of formation (1) |
| sandstone (1) |
| siltstone (1) |
| thickness of formation (1) |
| алевролит (1) |
| angle of occurrence (1) |
| argillite (1) |
| coal seam (1) |
| depth of development (1) |
| distance between layers (1) |
| roof of formation (1) |
| sandstone (1) |
| siltstone (1) |
| thickness of formation (1) |
| алевролит (1) |