HARD GROUND (SEDIMENTARY ENVIRONMENT)
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BTSEDIMENTARY HIATUSES (SEDIMENTARY ENVIRONMENT)
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UDC551.3,07*2
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Descriptor GERHARTGRUND (ABLAGERUNGSMILIEU)
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Descriptor ENGHARD GROUND (SEDIMENTARY ENVIRONMENT)
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Descriptor FREHARD GROUND (ENVIRONNEMENT SÉDIMENTAIRE)
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Variant ENGHARDGROUND (SEDIMENTARY ENVIRONMENT)