1. ACIDIC WEATHERING OF CARBONATE BUILDING STONES: EXPERIMENTAL ASSESSMENT (PRELIMINARY RESULTS). Authors: RYSZARD KRYZA, MARTA PRELL, FRANCISZEK CZECHOWSKI, MALGORZATA DOMARADZKA.2. WROCŁAW CATHEDRAL: USAGE OF LOCAL BUILDING STONES THROUGH THE PAST MILLENNIUM. Authors: RYSZARD KRYZA.