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| пластовый пепел | |||
| пепловые слои; пластовые пеплы; слои вулканического пепла | |||
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| слой вулканического пепла; пепловый слой | |||
| слой золы | |||
| ash beds: 1 phrase in 1 subject |
| Energy industry | 1 |
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