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Ice and Permafrost
6
Snow
6
ANTARCTIC REGIONS)
3
(*SNOW
2
ANTARCTIC REGIONS
2
BYRD STATION
2
DENSITY
2
DRILLING
2
MEASUREMENT
2
PERIODIC VARIATIONS
2
POLAR REGIONS
2
TEMPERATURE
2
(*COOLING + VENTILATING EQUIPMENT
1
(*ELECTRON DENSITY
1
(*GEOLOGIC AGE DETERMINATION
1
(*GREENLAND
1
(*ICE
1
(*NAVAL SHORE FACILITIES
1
(*STRUCTURES
1
*ANISOTROPY
1
*ANTARCTIC REGIONS
1
*ATMOSPHERICS
1
*Air bubbles
1
*Antarctic regions
1
*BUBBLES
1
*EXTREMELY LOW FREQUENCY
1
*GLACIERS
1
*ICE
1
*IONOSPHERIC PROPAGATION
1
*Ice
1
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