SILICEOUS ROCKS (MINERAL DEPOSITS)
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BTNATURAL STONE DEPOSITS + BUILDING STONES (MINERAL DEPOSITS)
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UDC553.57
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Descriptor GERKIESELGESTEINE (LAGERSTÄTTEN)
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Descriptor ENGSILICEOUS ROCKS (MINERAL DEPOSITS)
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Descriptor FREROCHES SILICEUSES (GISEMENTS)
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NTDIATOMACEOUS EARTH + KIESELGUR + TRIPOLI EARTH (MINERAL DEPOSITS)