22 photos in 5 sub-albums

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Wasserstrassen
122 photos in 6 sub-albums
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Kraftwerke
52 photos in 9 sub-albums
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Hüttenwerke
156 photos in 6 sub-albums
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typisch Pott
122 photos in 1 sub-album
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Landmarken
114 photos in 9 sub-albums
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Zechen und Bergwerke
542 photos in 83 sub-albums
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Halden
277 photos in 13 sub-albums