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(*GLACIERS
ANTARCTIC REGIONS
GREENLAND
Ice and Permafrost
3
Snow
3
DEPTH FINDING
2
RADAR REFLECTIONS
2
(*ICE
1
(*SURVEYING(GEOGRAPHIC)
1
*POLAR REGIONS)
1
AERIAL PHOTOGRAPHS
1
AERIAL RECONNAISSANCE
1
AIRBORNE
1
CAMP CENTURY
1
CANADA
1
CORRELATION TECHNIQUES
1
CRYSTAL GROWTH)
1
Cartography and Aerial Photography
1
DEPTH FINDING)
1
GLACIERS)
1
GLACIOLOGY
1
ICE
1
ICE ISLANDS
1
ICE REPORTING
1
LAND ICE
1
MEASURING INSTRUMENTS)
1
MELTING
1
PENETRATION
1
RADAR EQUIPMENT
1
RADAR SIGNALS
1
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