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*ARCTIC REGIONS
Ice and Permafrost
5
Snow
5
*SEA ICE
4
*ANTARCTIC REGIONS
3
AERIAL RECONNAISSANCE
2
AREA COVERAGE
2
Cartography and Aerial Photography
2
FILES(RECORDS)
2
*AERIAL PHOTOGRAPHS
1
*CARBON DIOXIDE
1
*MICROFILM
1
*POLAR REGIONS
1
*SCIENTIFIC SATELLITES
1
*Subarctic regions
1
AERIAL PHOTOGRAPHS
1
ANTARCTIC REGIONS
1
AS724
1
ATMOSPHERIC TEMPERATURE
1
Ablation seasons
1
Atmospheric Physics
1
BEHAVIOR
1
COEFFICIENTS
1
COMPARISON
1
DENSITY
1
DYNAMICS
1
EAST(DIRECTION)
1
ECOSYSTEMS
1
ENERGY TRANSFER
1
EXCHANGE
1
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