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AGE
2
DRILL
Depth
2
Drilling/drill rig
GISP
2
GISP2-D
GRIP/GISP/NGRIP
2
Greenland Ice Core Projects
2
Sampling/drilling ice
2
bottom/max
ice/snow
2
maximum/old
2
minimum/young
2
top/min
2
Ammonium
1
Calcium
1
Chloride
1
Ion chromatography
1
Magnesium
1
Methane sulfonic acid
1
Nitrate
1
Potassium
1
Sodium ion
1
Sulfate
1
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