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обрушение : 302 phrases in 17 subjects |
| Agriculture | 7 |
| Construction | 11 |
| Firefighting and fire-control systems | 1 |
| General | 6 |
| Geology | 62 |
| Geophysics | 7 |
| Hydrography | 1 |
| Hydrology | 19 |
| Mining | 103 |
| Natural resourses and wildlife conservation | 13 |
| Nautical | 5 |
| Oil / petroleum | 6 |
| Rail transport | 3 |
| Road works | 5 |
| Shipbuilding | 1 |
| Technology | 24 |
| Water supply | 28 |