by International Mining Forum (2008) | Sobczyk, Eugeniusz J | Kicki, Jerzy.
by International Mining Forum (2005) | Sobczyk, Eugeniusz J | Kicki, Jerzy.
by International Mining Forum (2009 : Krakow) | Sobczyk, Eugeniusz J | Kicki, Jerzy | Saługa, Piotr.
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