1. EXAMPLES OF WEATHERING AND DETERIORATION OF TERTIARY BUILDING STONES AT ST. MICHAEL’S CHURCH IN CLUJ NAPOCA (ROMANIA). Authors: ROMAN KOCH, CĂLIN P. RĂCĂTĂIANU, IOAN I. BUCUR.2. DIMENSION STONES OF THE OLD CITY WALL OF CLUJ-NAPOCA, ROMANIA – AN OVERVIEW ON HISTORY, MAPPING, WEATHERING, AND DAMAGES. Authors: ROMAN KOCH.3. ANCIENT BUILDING STONES FROM THE JABAL MAKDARAH AND JABAL HAYLAN AREA/YEMEN – CLASSIFICATION, ORIGIN AND WEATHERING BEHAVIOUR. Authors: ROMAN KOCH.