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barrels per barrel : 189 phrases in 14 subjects |
| Animal husbandry | 1 |
| Business | 22 |
| Chemistry | 1 |
| Drilling | 6 |
| Earth sciences | 27 |
| Economy | 3 |
| Finances | 1 |
| General | 14 |
| Geology | 1 |
| Mining | 74 |
| Oil / petroleum | 28 |
| Oil processing plants | 3 |
| Project management | 1 |
| Technology | 7 |
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