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treatment plant: 91 phrases in 17 subjects |
Agriculture | 1 |
Coal | 1 |
Construction | 7 |
Economy | 1 |
Electronics | 2 |
Environment | 39 |
General | 1 |
Industry | 2 |
Life sciences | 2 |
Metallurgy | 3 |
Name of organization | 1 |
Natural resourses and wildlife conservation | 21 |
Natural sciences | 1 |
Nuclear physics | 2 |
United Nations | 2 |
Waste management | 4 |
Water supply | 1 |