archive.org/web/20161015155236/http://www.panoramio.com/user/4619321?with_photo_id=37544016 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161017203852/http://www.panoramio.com/user/4619321?with_photo_id=40153879 operator: Panoramio described at URL: https://web.archive...
Nachtigall, Dünkelberg quarry in Witten (Germany) German Eingang des Nachtigallstollens im Steinbruch Dünkelberg (Muttental), Witten object of statement has role:...
archive.org/web/20161017124051/http://www.panoramio.com/user/4619321?with_photo_id=44126712 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161016235050/http://www.panoramio.com/user/4619321?with_photo_id=44216830 operator: Panoramio described at URL: https://web.archive...
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