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FREEZING
Ice and Permafrost
4
Snow
4
(*SEA ICE
3
ANTARCTIC REGIONS)
3
ATMOSPHERIC TEMPERATURE
3
MCMURDO SOUND
3
POLAR REGIONS
3
THICKNESS
3
DATA PROCESSING
2
ICE FORECASTING
2
ICE ISLANDS
2
ICEBREAKERS
2
MARINE TRANSPORTATION
2
MELTING
2
METEOROLOGICAL SATELLITES
2
PERIODIC VARIATIONS
2
PREDICTIONS
2
SEA ICE)
2
(*AERIAL RECONNAISSANCE
1
(*SNOW
1
(*WEATHER FORECASTING
1
*ARCTIC REGIONS)
1
AERIAL RECONNAISSANCE
1
ARCTIC OCEAN
1
BYRD STATION
1
COLD WEATHER TESTS
1
CRACKS
1
DEEP FREEZE 1968 OPERATION
1
DENSITY
1
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