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*THICKNESS
ALASKA
3
CANADA
3
Ice and Permafrost
3
LAKES
3
MEASUREMENT
RIVERS
3
Snow
ARCTIC REGIONS
2
ICE
2
MAPS
2
*ARCTIC REGIONS
1
*ICE
1
*ICE FORMATION
1
*NORTH AMERICA
1
*SEA ICE
1
*SNOW COVER
1
DISTRIBUTION
1
ICE REPORTING
1
NATIONAL GUARD
1
NETWORKS
1
NORTH AMERICA
1
OCEANS
1
REMOTE AREAS
1
REPORTS
1
SEA ICE
1
SEASONS
1
STATIONS
1
SUBARCTIC REGIONS
1
SURFACES
1
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