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