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Topic
- Fisheries 6
- Agriculture 4
- Bodies of water 4
- Conservation of natural resources 4
- Northwest, Pacific 4
- Wildlife conservation 4
- Hydroelectric power plants 2
- Irrigation projects 2
- Irrigation 2
- Maps 2
- National parks and reserves 2
- Photography 2
- Recreation 2
- Renewable energy sources 2
- Rivers 2
- Transportation 2
- Water resources development 2
- Water-power 2
- Aquifers 1
- Climate 1
