archive.org/web/20161024001658/http://www.panoramio.com/user/4645711?with_photo_id=66783418 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161025101946/http://www.panoramio.com/user/4645711?with_photo_id=77450805 operator: Panoramio described at URL: https://web.archive...
mouth) at Zeche Nachtigall, Dünkelberg quarry in Witten (Germany) German Eingang des Nachtigallstollens im Steinbruch Dünkelberg (Muttental), Witten object...
English operator: Panoramio described at URL: https://web.archive.org/web/20161012095934/http://www.panoramio.com/photo/4085580...
archive.org/web/20161016181043/http://www.panoramio.com/user/4645711?with_photo_id=40622232 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161019220240/http://www.panoramio.com/user/4645711?with_photo_id=52616673 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161024211756/http://www.panoramio.com/user/969909?with_photo_id=83717467 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161022111032/http://www.panoramio.com/user/969909?with_photo_id=56870921 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161025000857/http://www.panoramio.com/user/4645711?with_photo_id=74942451 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161021102122/http://www.panoramio.com/user/969909?with_photo_id=67257226 operator: Panoramio described at URL: https://web.archive...
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