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(*PERMAFROST
(*SOILS
2
*TUNDRA
2
FREEZING
ICE
2
Ice and Permafrost
2
MELTING
2
PLANTS(BOTANY)
SWAMPS
2
Snow
2
Soil Mechanics
2
*FREEZING
1
*SOILS
1
ALASKA)
1
ARCTIC REGIONS
1
ARCTIC REGIONS)
1
DRAINAGE
1
ECOLOGY
1
EROSION
1
FOREST LAND
1
FORESTRY
1
GLACIERS
1
HYDROLOGY
1
INTERACTIONS
1
LIMNOLOGY
1
MARINE BIOLOGY
1
METEOROLOGICAL PHENOMENA
1
MICROMETEOROLOGY
1
MOISTURE
1
PHOTOSYNTHESIS
1
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