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PERMAFROST
6
RIVERS
SNOW
ALASKA
3
EROSION
3
Hydrology
3
Limnology and Potamology
3
*GEOMORPHOLOGY
2
DEPOSITS
2
Geochemistry and Mineralogy
2
Geology
2
SEA ICE
2
SOILS
2
WATER
2
WIND
2
(*CLIMATE
1
(*DELTAS
1
(*SIBERIA
1
(*USSR
1
*CLIMATE
1
*DELTAS
1
*HYDROLOGY
1
*PROFILOMETERS
1
*RADAR EQUIPMENT
1
*RADAR PULSES
1
*WATERSHEDS
1
AIR TEMPERATURE LAPSE RATE
1
AIRBORNE
1
ARCTIC OCEAN
1
ARCTIC REGIONS)
1
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