Danish Tipping (Shallow) Drill
Citation   | Year |
| Johnsen, S.J., W. Dansgaard, N. Gundestrup, S.B. Hansen, J.O. Nielsen and N. Reeh . 1980 . A Fast Light-Weight Core Drill, Journal of Glaciology, Volume 25, Number 91, Pages 169-174 | 1980 |
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