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DRILL
10
Depth
10
Drilling/drill rig
GISP
10
GRIP/GISP/NGRIP
Greenland Ice Core Projects
10
Sampling/drilling ice
10
bottom/max
10
ice/snow
10
top/min
AGE
9
maximum/old
7
minimum/young
7
Calcium
5
GISP2
5
Ammonium
4
Chloride
4
Magnesium
4
Nitrate
4
Potassium
4
Sodium ion
4
Sulfate
4
GISP2-B
2
GISP2-D
2
Ion chromatography
2
Methane sulfonic acid
2
standard deviation
2
Accelerator mass spectrometry (AMS)
1
Air content
1
Aluminosilicate insoluble particles
1
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