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- 研究 (4)
- rivers (3)
- environmental aspects (2)
- history (2)
- restoration ecology (2)
- water-supply (2)
- 中国历史 (2)
- 作品集 (2)
- 史评 (2)
- 长篇小说 (2)
- arid regions (1)
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- city planning (1)
- computer systems (1)
- cooper, ben (fictitious character) (1)
- dams (1)
- data processing (1)
- derbyshire (england) (1)
- detective and mystery stories (1)
- economic aspects (1)
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