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AERIAL RECONNAISSANCE
2
ARCTIC REGIONS
2
FLIGHT PATHS
FREEZING
2
ICE ISLANDS
2
Ice and Permafrost
2
MELTING
2
Meteorology
2
OBSERVATION AIRCRAFT
2
SEA ICE
Snow
2
THICKNESS
2
*ARCTIC OCEAN
1
*WEATHER FORECASTING
1
ARCTIC OCEAN
1
CRACKS
1
DENMARK STRAIT
1
DIURNAL VARIATIONS
1
ELECTRONIC AIRCRAFT
1
GREENLAND
1
GREENLAND SEA
1
INFRARED SCANNING
1
LASERS
1
METEOROLOGICAL RADAR
1
NAVIGATION CHARTS
1
OCEANOGRAPHIC SHIPS
1
PATROL CRAFT
1
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