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- Water[remove]17,392
- Pollution8,704
- Law and legislation2,606
- Purification2,175
- Environmental aspects1,937
- Water quality1,637
- Analysis1,402
- Water-supply1,358
- Water quality management960
- Groundwater700
- Measurement617
- Hydrology556
- Sewage544
- Toxicology524
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- Water resources development480
- Research420
- Water rights385
- Pesticides344