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54 Environmental Sciences
9
Alaska
Ecosystems
Surface Waters
Arctic Regions
7
Mass Transfer
7
58 Geosciences
6
Atmospheric Precipitations
6
Evaporation
6
Ground Water
6
Heat Transfer
6
Hydrology
6
Meteorology
6
North America
6
Snow
6
Watersheds
6
Energy Balance
5
Progress Report
5
Computerized Simulation
4
Developed Countries
4
Document Types
4
Historical Aspects
4
Hydrogen Compounds
4
Oxygen Compounds
4
Polar Regions
4
Terrestrial-- Site Resource & Use Studies-- (1990-)
4
Usa
4
580000
3
580000 -- Geosciences
3
Energy Transfer
3
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