"Operation of gravel and sand pits; mining of clays and kaolin" auf Deutsch
| Operation of gravel and sand pits; mining of clays and kaolin | Gewinnung von Kies, Sand, Ton und Kaolin |
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| Operation of gravel and sand pits; mining of clays and kaolin | Gewinnung von Kies, Sand, Ton und Kaolin |
| Cat 1 - 1
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| |