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AGE
Depth
GRIP/GISP/NGRIP
8
Greenland Ice Core Projects
Sampling/drilling ice
8
bottom/max
8
ice/snow
8
maximum/old
8
minimum/young
top/min
8
DRILL
7
Drilling/drill rig
7
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
Accelerator mass spectrometry (AMS)
1
Accumulation of snow/ice per year
1
Beryllium-10
1
Calculated
1
Elzone Particle Counter
1
GRIP
1
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