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Steenkolenmijnen. Ontginning. Wetenschappelijk onderzoek. (Repertorium) --- Steenkolen. Voorbereiding. Wetenschappelijk onderzoek. (Repertorium) --- Charbon. Géologie. Recherche scientifique. (Répertoire) --- Mines de charbon. Exploitation. Recherche scientifique. (Répertoire) --- Charbon. Préparation. Recherche scientifique. (Répertoire) --- Steenkolen. Geologie. Wetenschappelijk onderzoek. (Repertorium)
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