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Ice and Permafrost
6
Snow
6
ANTARCTIC REGIONS
5
CANADA
4
GREENLAND
3
(*GLACIERS
2
GLACIERS
2
ICE ISLANDS
2
MELTING
2
POLAR REGIONS
2
RADAR REFLECTIONS
2
SYMPOSIA
2
(*ICE
1
(*PERMAFROST
1
(*SNOW
1
(*SURVEYING(GEOGRAPHIC)
1
*ABSTRACTS)
1
*ANTARCTIC REGIONS
1
*ARCTIC REGIONS
1
*BIBLIOGRAPHIES)
1
*DRILLING MACHINES
1
*GLACIERS
1
*ICE
1
*Ice cores
1
*Ice drilling
1
*Ice drills
1
*RESEARCH MANAGEMENT
1
*SYMPOSIA
1
AERIAL PHOTOGRAPHS
1
AERIAL RECONNAISSANCE
1
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