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- Infrastructure (Economics) 13
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- Politics and government 9
- Mental illness 8
- Natural resources--Co-management 8
- Manuscripts, French 7
- Water-power 6
- Economic development 5
- Flood control 5
- Water quality 5
- Chinese 4
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- Taoism 4
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- Miniature books 3
- Water boundaries 3
- Water-supply 3
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- Correspondence 2
- Dissociation 2