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EARTH SCIENCE > CRYOSPHERE > FROZEN GROUND > PERMAFROST
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FIELD SURVEY
EARTH SCIENCE > HUMAN DIMENSIONS > SOCIAL BEHAVIOR
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environment
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society
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EARTH REMOTE SENSING INSTRUMENTS > PASSIVE REMOTE SENSING > POSITIONING/NAVIGATION > GPS > GPS > GLOBAL POSITIONING SYSTEM
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IN SITU/LABORATORY INSTRUMENTS > PROBES > SOIL DEPTH PROBE
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