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*UNDERGROUND STRUCTURES
CONSTRUCTION
7
Structural Engineering and Building Technology
6
Ice and Permafrost
5
Snow
5
ICE
4
POLAR REGIONS
4
VENTILATION
4
*SNOW
3
ANTARCTIC REGIONS
3
BUILDINGS
3
COOLING
3
DEFORMATION
3
MAINTENANCE
3
SNOW
3
UNDERSNOW CAMPS
3
*ICE
2
AIR
2
ATMOSPHERIC TEMPERATURE
2
Air Condition
2
BYRD STATION
2
GLACIERS
2
GREENLAND
2
HEAT
2
Heating
2
LOW TEMPERATURE
2
Lighting & Ventilating
2
STRATIGRAPHY
2
*ARCTIC REGIONS
1
*COOLING
1
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