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DEPTH
ANTARCTIC REGIONS
3
Ice and Permafrost
3
Snow
3
*RUNWAYS
2
Active & Passive Radar Detection & Equipment
2
BURIED OBJECTS
2
Civil Engineering
2
Meteorology
2
PROFILES
2
SITE INVESTIGATIONS
2
SPATIAL DISTRIBUTION
2
SUBSURFACE
2
Terminal Flight Facilities
2
*ANTARCTIC REGIONS
1
*BIOLOGICAL CONTAMINATION
1
*CLIMATE
1
*ENVIRONMENTAL IMPACT
1
*GLACIERS
1
*GREENLAND
1
*ICE FORMATION
1
*LAND ICE
1
*PAVEMENTS
1
*PERMAFROST
1
*POLAR REGIONS
1
*Paleoenvironmental data
1
*RADAR EQUIPMENT
1
*RADAR IMAGES
1
*ROADS
1
*RUNOFF
1
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