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Topic
Forest management
14
Irrigation
10
Environmental aspects
9
Forest reserves
6
Recreational use
6
Apples
5
Cotton
5
Watershed management
5
Flood control
4
History
4
Hydrology
4
Marketing
4
Water resources development
4
Water-supply
4
Agriculture
3
Alfalfa
3
Costs
3
Economic aspects
3
Groundwater
3
Logging
3