archive.org/web/20161023172641/http://www.panoramio.com/user/969909?with_photo_id=58765569 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...
archive.org/web/20161021045719/http://www.panoramio.com/user/4645711?with_photo_id=62820946 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161015104125/http://www.panoramio.com/user/4645711?with_photo_id=37149066 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161016190128/http://www.panoramio.com/user/4645711?with_photo_id=42731881 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161020190921/http://www.panoramio.com/user/969909?with_photo_id=53876697 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161028034821/http://www.panoramio.com/user/969909?with_photo_id=92348618 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161013184816/http://www.panoramio.com/user/1539532?with_photo_id=28352036 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161029034333/http://www.panoramio.com/user/969909?with_photo_id=93277242 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161013152623/http://www.panoramio.com/user/1542976?with_photo_id=29356486 operator: Panoramio described at URL: https://web.archive...
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