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Mines et ressources minieres --- Ventilation --- Ventilation
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Charbon --- Mines et ressources minieres --- Hydrostatique --- Mines et extraction
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CHARBON --- INDUSTRIE MINIERE --- GITES MINERAUX --- MINES ET RESSOURCES MINIERES --- MINES ET RESSOURCES MINIERES --- MINES ET EXTRACTION --- EXPLOITATION A CIEL OUVERT
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Mines et ressources minieres --- Histoire --- Aachen (r.f.a.) --- Industrie --- Histoire
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