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well service : 22 phrases in 11 subjects |
| Automobiles | 1 |
| Commerce | 1 |
| Drilling | 4 |
| Engineering geology | 1 |
| General | 1 |
| Geophysics | 3 |
| Mining | 1 |
| Navigation | 2 |
| Oil / petroleum | 6 |
| Technology | 1 |
| United Nations | 1 |
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