Topics
Dams
Hydroelectric power plants
9
Recreational use
Rivers
6
Social aspects
6
Recreational surveys
4
River surveys
4
Environmental aspects
3
Research
3
Aesthetic resources
2
Archaeological significance
2
Economic aspects
2
Power utilization
2
White-water canoeing
2
Wilderness areas
2
Effect of dams on
1
Fishes
1
Pacific salmon fishing
1
Rafting (Sports)
1