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CANADA
4
GREENLAND
MEASUREMENT
ARCTIC REGIONS
2
Ice and Permafrost
2
MAPS
2
Snow
2
(*RADIO TRANSMISSION
1
*ARCTIC REGIONS
1
*COSMIC RAYS
1
*DRIFT
1
*NORTH AMERICA
1
*Robeson Channel
1
*SEA ICE
1
ALASKA
1
ATTENUATION
1
Astrophysics
1
BALLOONSONDES
1
BAYS
1
CLOSED CIRCUIT TELEVISION
1
ELLESMERE ISLAND
1
HIGH ALTITUDE
1
ICE
1
IOWA
1
LAKES
1
MOVING TARGET INDICATORS
1
Meteorology
1
NIKE-DEACON
1
NOSE CONES
1
OCEAN CURRENTS
1
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