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ice thickness measurements
radio echo sounding
4
radio glaciology
4
and other methods
2
internal layering
2
radioactivity
2
remote sensing
2
02. Cryosphere::02.03. Ice cores::02.03.09. Instruments and techniques
1
02. Cryosphere::02.03. Ice cores::02.03.99. General or miscellaneous
1
02.03.09. Instruments and techniques
1
02.03.99. General or miscellaneous
1
04. Solid Earth::04.02. Exploration geophysics::04.02.05. Downhole
1
04.02.05. Downhole
1
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