1. ISOTOPIC COMPOSITION OF PRECIPITATION SULPHATES AS AN INDICATOR OF POLLUTANT ORIGIN IN WROCłAW (SW POLAND) PRECIPITATIONS. Authors: MACIEJ GÓRKA, MARIUSZ-ORION JĘDRYSEK, DARIUSZ STRĄPOĆ.2. FLEXIBLE INLET SYSTEM FOR ON-LINE COMPOUND-SPECIFIC δD AND δ13C ANALYSES OF NATURAL GASES. Authors: MARK HENNING, DARIUSZ STRĄPOĆ, PETER SAUER, JON FONG, ARNDT SCHIMMELMANN, MARIA MASTALERZ.3. ISOTOPIC SIGNATURE OF LLANDOVERIAN OPEN MARINE BEDDED CHERTS FROM BARDO SYNCLINE, HOLY CROSS MOUNTAINS, CENTRAL POLAND: PRELIMINARY RESULTS. Authors: TOMASZ OCHMAŃSKI, DARIUSZ STRĄPOĆ, CRAIG MOORE, ARINDAM SARKAR.