Access to the Nachtigallstollen, GeoRoute Ruhr, Duenkelberg quarry, in the Muttental valley, here you can see the geology of the region, a thin seam of hard coal is visible, underneath were thicker layers of hard coal that were mined, Witten, North Rhine-Westphalia, Germany, Europe

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TOP30025070

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達志影像

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RM

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須由TPG 完整授權

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no

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