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| охрана недр (Alexander Demidov); недропользование (this is part of soil science – Subsoil Management Techniques (Advances in Soil Science) Alexander Demidov) | |||
| subsoil management: 6 phrases, 4 sujets |
| Général | 2 |
| Géologie | 2 |
| Karachaganak | 1 |
| Pétrole et gaz | 1 |