Topics
Hydroelectric power plants
Social aspects
Dams
9
Economic aspects
8
Recreational use
6
Recreational surveys
5
River surveys
4
Rivers
4
Economic conditions
3
Research
3
Aesthetic resources
2
Archaeological significance
2
Economic history
2
Power utilization
2
Regional economics
2
Social conditions
2
Wilderness areas
2
Business enterprises
1
Economic surveys
1
Economics
1
Household surveys
1
Households
1
Mathematical models
1
Natural resources
1
Natural resources surveys
1
Outdoor recreation
1
Public opinion
1