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Ice and Permafrost
2
Snow
2
TRANSLATIONS
2
USSR
2
*ANTARCTIC REGIONS
1
*DRILLING
1
*GLACIERS
1
*Thermal drilling
1
AERIAL PHOTOGRAPHY
1
BOREHOLES
1
CLASSIFICATION
1
CONSTRUCTION
1
DEEP FREEZE OPERATION
1
DRILLING MACHINES
1
DRILLS
1
HISTORY
1
ICE ISLANDS
1
ICE PENETRATION
1
Ice drills
1
MAPPING
1
NUMERICAL ANALYSIS
1
SEA ICE
1
SOUTH POLE
1
THERMAL PROPERTIES
1
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