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Iron industry and trade. --- Coal mines and mining. --- Gases.
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Mines and mineral resources --- Coal mines and mining --- Government ownership.
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Iron industry and trade. --- Coal mines and mining. --- Gases.
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Mines de charbon. --- Coal mines and mining. --- Mines (sites d'extraction) --- Mineral industries.
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Coal trade --- Coal mines and mining --- World War, 1914-1918 --- Charbon --- Première guerre mondiale --- Economic aspects --- Mines et extraction --- Aspect économique
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