Jan Urban Polish Academy of Sciences, Institute of Nature Conservation, al. Adama Mickiewicza 33, 31-120 Kraków Poland
Andrzej Tyc University of Silesia, Faculty of Earth Sciences, Department of Geomorphology, ul. Będzińska 60, 41-200 Sosnowiec Poland
Andrzej Kasza Świętokrzyski Speleoclub in Kielce, ul. Żurawia 23, 25-653 Kielce Poland
Marceli Ślusarczyk Fundacja Przyroda i Człowiek, Kostkowice, ul. Górska 21, 42-425 Kroczyce Poland
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