Topics
Hydroelectric power plants
6
Dams
4
Hydrology
4
Climate
3
Environmental aspects
3
Ice mechanics
3
Ice on rivers, lakes, etc
3
Economic aspects
2
Economic conditions
2
Economic history
2
Regional economics
2
Social aspects
2
Social conditions
2
Temperature
2
Animals
1
Ecology
1
Environmental conditions
1
Fishes
1
Licenses
1