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*ANTARCTIC REGIONS
2
*ICE
2
*LANDING FIELDS
2
COLD REGIONS
2
GLACIERS
2
Ice and Permafrost
2
LAND ICE
2
POLAR CAP
POLAR REGIONS
2
RUNWAYS
2
Snow
2
Terminal Flight Facilities
2
*AIRPORTS
1
*TRANSPORT AIRCRAFT
1
ABLATION
1
AERIAL PHOTOGRAPHS
1
AIRCRAFT
1
CONSTRUCTION
1
COSTS
1
GEOLOGICAL SURVEYS
1
Geochemistry and Mineralogy
1
Geology
1
IMAGES
1
LIMITATIONS
1
LOW COSTS
1
MACHINES
1
MAINTENANCE
1
MAJORITIES
1
MILITARY REQUIREMENTS
1
NUMBERS
1
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