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ANIMALS/VERTEBRATES
3
ANTARCTICA >
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3
EARTH SCIENCE >
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GEOGRAPHIC REGION >
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MAMMALS
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POLAR
SEA ICE
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SEALS/SEA LIONS/WALRUSES
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Weddell Seal
biota
3
oceans
3
AMD
2
AMD/AU
2
BIOLOGICAL CLASSIFICATION
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BIOSPHERE
2
CARNIVORES
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CEOS
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CRYOSPHERE
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Diel activity
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EARTH SCIENCE
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ECOLOGICAL DYNAMICS
2
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FIELD SURVEYS
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HYDROPHONES
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ICE EDGES
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ICE TYPES
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Leptonychotes weddellii
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