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NAVIGATION
GREENLAND
5
Ice and Permafrost
4
Snow
4
*SEA ICE
3
GREENLAND SEA
3
ICE
3
IMAGES
3
TEMPERATURE
3
*ARCTIC REGIONS
2
ARCTIC REGIONS
2
Acoustics
2
EDGES
2
HIGH LATITUDES
2
ICEBREAKERS
2
MEASUREMENT
2
REGIONS
2
UNDERICE
2
USSR
2
(*LAKES
1
(*RADIO NAVIGATION
1
(*SEA ICE
1
(*VERY LOW FREQUENCY
1
*ACOUSTIC MEASUREMENT
1
*ARCTIC REGIONS)
1
*ARTIFICIAL SATELLITES
1
*COMPUTER PROGRAMS
1
*ELECTROMAGNETIC WAVE PROPAGATION
1
*GREENLAND SEA
1
*IMAGE CONVERTERS
1
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Greenland
9
Arctic
6
Greenland Sea
4
Ice
4
Sea ice
4
permafrost
4
Arctic Ocean
2
East Greenland
2
Arctic Archipelago
1
Beaufort Sea
1
Bering Sea
1
Canadian Arctic Archipelago
1
Fram Strait
1
Ice cap
1
Labrador Sea
1
Newfoundland
1
North Atlantic
1
Point Barrow
1
Scoresby Sound
1
Svalbard
1
Thule
1
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