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| первичные битумы | |||
| первичный битум | |||
| протобитум (первичная стадия превращения органического вещества в нефть) | |||
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protobitumen : 4 phrases in 3 subjects |
| Agrochemistry | 1 |
| Geology | 2 |
| Oil and gas | 1 |
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