| First Workshop on Hardrock Hydrogeology of the Bohemian Massif - Rohanov 1994 |
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| Second Workshop on Hardrock Hydrogeology of the Bohemian Massif - Borowice 1996 |
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| First Workshop of the Iberian Working Group on Hardrock Hydrogeology - Miraflores de la Sierra 1997 |
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| Second Workshop on Hardrock Hydrogeology of the Fennoscandian Shield - Oslo 2001 |
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| First Workshop of the Regional WG of the Middle and East Mediterranean - Tinos 2002 |
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| International Conference on „Groundwater in Fractured Rocks" - Prague 2003 |
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| Third Workshop of the Fennoscandian RWG - Helsinki 2004 |
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| Second Workshop of the Iberian RWG – Évora 2005 |
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| Fourth Workshop of the RWG of the Bohemian Massif – Jugowice 2006 |
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IAH - Commission on Hardrock Hydrogeology - HyRoC