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| trenching study (Andy) | |||
| trenching | |||
| channel sampling (по способу отбора MichaelBurov); trench sampling (по способу отбора MichaelBurov) | |||
| channel sampling (vbadalov); sampling channel sampling | |||
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бороздовое опробование : 4 a las frases, 1 temas |
| Minería de oro | 4 |