source: UNESCO/CPE Description is available under license CC-BY-SA IGO 3.0 Mijnen van Rammelsberg, historische stad Goslar en Oberharz watermanagementsysteem Het Oberharz ...
source: UNESCO/CPE Description is available under license CC-BY-SA IGO 3.0 Mijnen van Rammelsberg, historische stad Goslar en Oberharz watermanagementsysteem Het Oberharz ...
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