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rock clay : 13 phrases in 9 subjects |
| Agrochemistry | 1 |
| Electronics | 1 |
| Geology | 3 |
| Makarov | 1 |
| Oil / petroleum | 1 |
| Oil and gas | 2 |
| Oil and gas technology | 1 |
| Oilfields | 2 |
| Silicate industry | 1 |
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