Topics
Climate
30
Climatology
24
Archaeological surveying
11
Antiquities
10
Environmental aspects
6
Hydroelectric power plants
6
Ice on rivers, lakes, etc
6
Hydrology
5
Ice mechanics
5
Temperature
5
Geology
4
Dams
3
Alaska Natives
2
Economic aspects
2
Economic conditions
2
Economic history
2
Excavations (Archaeology)
2
Historic sites
2
Measurement
2
Regional economics
2
Social aspects
2
Social conditions
2
Stream measurements
2
Air quality
1
Archaeological geology
1
Cultural property
1
Design and construction
1
Ethnology
1
Freezes (Meteorology)
1
Geological surveys
1
Ice
1
Methodology
1
Paleontological excavations
1
Particles
1
Roads
1
Soil surveys
1
Soils
1