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