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GRIP/GISP/NGRIP
7
Greenland Ice Core Projects
Sampling/drilling ice
7
AGE
6
GISP
6
Sulfate
6
Ammonium
5
Calcium
5
DRILL
5
Depth
5
Drilling/drill rig
5
Magnesium
5
Nitrate
5
Potassium
5
bottom/max
5
ice/snow
5
top/min
5
Chloride
4
Sodium ion
4
maximum/old
4
minimum/young
4
GISP2
2
GISP2-B
2
AERO
1
ALTITUDE
1
ATM
1
Aerological investigations
1
Calcium cation
1
Calculated
1
Chloride anion
1
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