Topics
Social aspects
Dams
9
Hydroelectric power plants
8
Economic aspects
6
Research
5
Construction projects
4
Economic conditions
4
Economics
4
Human services
4
Public goods
4
Recreational surveys
4
Recreational use
4
River surveys
4
Rivers
4
Social conditions
4
Sociological aspects
4
Air quality
2
Transportation
2
Outdoor recreation
1