SULPHUR + SELENIUM + TELLURIUM (MINERAL DEPOSITS)
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BTECONOMIC MINERALS AND EARTHS, INORGANIC (MINERAL DEPOSITS)
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UDC553.66
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Descriptor GERSCHWEFEL + SELEN + TELLUR (LAGERSTÄTTEN)
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Descriptor ENGSULPHUR + SELENIUM + TELLURIUM (MINERAL DEPOSITS)
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Descriptor FRESOUFRE + SELENIUM + TELLURIUM (GISEMENTS)
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NTSULFUR DEPOSITS