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Mineralogy. --- Minéralogie --- Roches --- Rocks. --- Minéralogie
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Géologie économique --- Minéraux industriels --- Mineralogy. --- Rocks. --- Industrial minerals.
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Coal preparation. --- Charbon --- Préparation. --- Préparation.
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Mining engineering --- Technique minière --- Mining engineering. --- Technique minière. --- Technique minière.
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