Topics
Climate
23
Climatology
17
Ice on rivers, lakes, etc
6
Hydrology
5
Ice mechanics
5
Temperature
5
Environmental aspects
4
Hydroelectric power plants
3
Dams
2
Stream measurements
2
Economic aspects
1
Economic conditions
1
Economic history
1
Freezes (Meteorology)
1
Ice
1
Measurement
1
Regional economics
1
Roads
1
Social aspects
1
Social conditions
1