 |
| |||
| caving; potholing | |||
| процесс обрушения: 3 phrases in 3 subjects |
| Bridge construction | 1 |
| Construction | 1 |
| Natural resourses and wildlife conservation | 1 |
|
| |||
| caving; potholing | |||
| процесс обрушения: 3 phrases in 3 subjects |
| Bridge construction | 1 |
| Construction | 1 |
| Natural resourses and wildlife conservation | 1 |