Sarre
BB039 Privatgrube Fischbach
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http://geow.uni.lu/index.php/fr/articles/wi55/st71/sa93?id=72&task=view#sigProId3022ebb0ed
http://geow.uni.lu/index.php/fr/articles/wi55/st71/sa93?id=72&task=view#sigProId3022ebb0ed
Quellen / Sources: 1) M. Helfer