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schiste combustible; pyroschiste m | |||
schiste bitumineux | |||
schiste bitumineux (crude oil alternative) | |||
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schiste bitumineux |
oil shale: 8 phrases in 4 subjects |
General | 1 |
International Monetary Fund | 1 |
Natural resourses and wildlife conservation | 4 |
Oil / petroleum | 2 |