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Antarctica
2
South Pole
ice core
2
Arctic
1
East Antarctica
1
GISP2
1
Greenland
1
Physical Sciences and Mathematics
1
WAIS Divide
1
acetylene
1
air bubble
1
dilution
1
ethane
1
gas chromatography
1
ice
1
industrialization
1
isotopes
1
mass spectrometry
1
methyl bromide
1
mixing ratio
1
ozone
1
southern hemisphere
1
temporal variation
1
trend analysis
1
twentieth century
1
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