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Antarctica
2
East Antarctica
2
Physical Sciences and Mathematics
2
South Pole
2
air bubble
ice core
2
mixing ratio
twentieth century
2
carbonyl compound
1
dilution
1
gas chromatography
1
ice
1
industrialization
1
isotopes
1
little ice age
1
mass spectrometry
1
medieval
1
methyl bromide
1
ozone
1
southern hemisphere
1
sulfide
1
temporal variation
1
trend analysis
1
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