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*ARCTIC REGIONS
ALASKA
2
Ice and Permafrost
2
Meteorology
POLAR REGIONS
2
SEA ICE
Snow
THICKNESS
2
*ICE FORECASTING
1
*NORTH AMERICA
1
*WEATHER FORECASTING
1
AERIAL RECONNAISSANCE
1
CANADA
1
CRACKS
1
DATA ACQUISITION
1
DATA PROCESSING EQUIPMENT
1
DIURNAL VARIATIONS
1
FREEZING
1
GREENLAND
1
ICE
1
ICE ISLANDS
1
LAKES
1
MAPS
1
MEASUREMENT
1
MELTING
1
METEOROLOGICAL CHARTS
1
PHOTOGRAMMETRY
1
REPORTS
1
WEATHER
1
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