 |
| sludge tank: 53 phrases in 17 subjects |
| Caspian | 3 |
| Construction | 6 |
| Ecology | 7 |
| Forestry | 1 |
| Gas processing plants | 1 |
| Makarov | 1 |
| Molikpaq | 3 |
| Natural resourses and wildlife conservation | 7 |
| Nautical | 2 |
| Oil and gas | 7 |
| Oil and gas technology | 1 |
| Sakhalin | 2 |
| Sakhalin S | 1 |
| Technology | 6 |
| Transport | 1 |
| Water resources | 3 |
| Water supply | 1 |