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GREENLAND
Ice and Permafrost
9
Snow
9
(*GLACIERS
4
ANTARCTIC REGIONS
4
ICE
4
(*ICE
2
DEPTH FINDING
2
GLACIERS
2
Geochemistry and Mineralogy
2
Geology
2
IMPURITIES
2
MELTING
2
PENETRATION
2
RADAR REFLECTIONS
2
(*SNOW
1
(*SURVEYING(GEOGRAPHIC)
1
*ARCTIC REGIONS
1
*ICE
1
*ICE BLISTERS
1
*ICE FORMATION
1
*POLAR REGIONS)
1
*ROADS
1
*SHELTERS
1
*UNDERGROUND STRUCTURES
1
*WATER SUPPLIES
1
ABLATION
1
AERIAL PHOTOGRAPHS
1
AERIAL RECONNAISSANCE
1
AIRBORNE
1
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