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AGE
DRILL
5
Drilling/drill rig
GISP
5
GRIP/GISP/NGRIP
5
Greenland Ice Core Projects
5
Sampling/drilling ice
5
Sulfate
Ammonium
4
Calcium
4
Chloride
4
Depth
4
Magnesium
4
Nitrate
4
Potassium
4
Sodium ion
4
bottom/max
4
ice/snow
4
maximum/old
4
minimum/young
4
top/min
4
GISP2
2
GISP2-B
2
Calculated
1
GISP2-D
1
Hydrogen peroxide
1
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