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*LAKES
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*MEASUREMENT
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*NORTHWEST TERRITORIES
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*NUNAVUT(CANADA)
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*RIVERS
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*SNOW
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*SNOW MEASUREMENTS
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*SURVEYS
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*TUNDRA
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ALASKA
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BASE LINES
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BRIGHTNESS
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BRIGHTNESS TEMPERATURES
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CORE SAMPLING
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DENSITY
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DEPTH
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Equipment and Methods
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GRAIN SIZE
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GRAPHS
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GREAT BEAR LAKE
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Geography
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ICE
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ICE THICKNESS
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INFRARED IMAGES
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ION MEASUREMENTS
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IONS
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ISOTOPE MEASUREMENTS
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ISOTOPES
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Ice and Permafrost
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LAYERS
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