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Keywords: caveman0043, www.nutons.nl, www.mc-quadrat.at, slivarske ponikve, slivrske ponikve, slivje, matarsko podolje, materija, markovscina, slovenia, karst, kras, cave, caving, grot, grotte, speleologie, höhle, höhlenforschen, jama, brezno
Video length: 06:25
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