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| subterranean retorting (горючих сланцев); in-situ mineral distillation (lxu5); underground mineral distillation (lxu5) | |||
| подземная перегонка: 6 phrases, 4 sujets |
| Exploitation minière | 3 |
| Industrie de l'industr. | 1 |
| Ressources naturelles et conservation de la faune | 1 |
| Technologie | 1 |