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*ARCTIC OCEAN)
2
ICE ISLANDS
2
PERIODIC VARIATIONS
2
POLAR REGIONS
2
TERRAIN
2
VISUAL INSPECTION
2
(*ICE
1
(*OCEANOGRAPHIC DATA
1
(*SEA ICE
1
(*WEATHER FORECASTING
1
*ARCTIC REGIONS)
1
AERIAL PHOTOGRAPHY
1
ARCTIC OCEAN ISLANDS
1
ARCTIC REGIONS
1
BIRDS EYE MISSIONS(POLAR RESEARCH FLIGHTS)
1
BIRDS EYE PROJECT
1
C-121 AIRCRAFT
1
CRACKS
1
DATA PROCESSING
1
FLIGHT PATHS
1
FREEZING
1
Ice and Permafrost
1
MAPPING
1
Meteorology
1
NAVAL RESEARCH
1
NAVIGATIONAL AIDS
1
OBSERVATION AIRCRAFT
1
PLOTTING BOARDS
1
Physical and Dynamic Oceanography
1
RADAR NAVIGATION
1
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