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AGE
9
Sampling/drilling ice
9
ice/snow
maximum/old
minimum/young
9
DRILL
8
Depth
8
Drilling/drill rig
8
GRIP/GISP/NGRIP
8
Greenland Ice Core Projects
8
bottom/max
8
top/min
8
GISP
7
Ammonium
4
Calcium
4
Chloride
4
Magnesium
4
Nitrate
4
Potassium
4
Sodium ion
4
Sulfate
4
GISP2
3
GISP2-B
2
GISP2-D
2
GRIP
2
Greenland
2
ISTUK
2
ISTUK electromechanical drill
2
Accelerator mass spectrometry (AMS)
1
Accumulation of snow/ice per year
1
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