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(*ICE
3
(*WEATHER FORECASTING
3
*ARCTIC OCEAN)
*ARCTIC REGIONS)
3
BIRDS EYE PROJECT
3
ICE ISLANDS
3
Ice and Permafrost
3
Meteorology
POLAR REGIONS
SEA ICE
3
SEA WATER
3
Snow
3
TERRAIN
3
C-121 AIRCRAFT
2
DATA PROCESSING
2
FLIGHT PATHS
2
MAPPING
2
NAVIGATIONAL AIDS
2
OBSERVATION AIRCRAFT
2
PERIODIC VARIATIONS
2
PLOTTING BOARDS
2
RADAR NAVIGATION
2
TRANSPORT AIRCRAFT
2
VISUAL INSPECTION
2
AERIAL RECONNAISSANCE
1
ALASKA
1
CLIMATE
1
COASTAL REGIONS
1
DISTRIBUTION
1
DIURNAL VARIATIONS
1
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