Topics
Climate
24
Climatology
18
Ice on rivers, lakes, etc
7
Hydrology
6
Ice mechanics
5
Temperature
5
Environmental aspects
4
Hydroelectric power plants
3
Dams
2
Freezes (Meteorology)
2
Ice
2
Measurement
2
Stream measurements
2
Economic aspects
1
Economic conditions
1
Economic history
1
Regional economics
1
Roads
1
Social aspects
1
Social conditions
1