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Water Pollution Control : 85 phrases in 18 subjects |
| American usage, not spelling | 1 |
| Ecology | 26 |
| Economics | 2 |
| Energy industry | 11 |
| Finances | 2 |
| Forestry | 1 |
| General | 1 |
| Makarov | 6 |
| Medical | 3 |
| Natural resourses and wildlife conservation | 12 |
| Nautical | 1 |
| Oil / petroleum | 2 |
| Oil and gas | 1 |
| Technology | 1 |
| Transport | 1 |
| United Nations | 1 |
| Water supply | 10 |
| Weapons of mass destruction | 3 |