Natural and anthropogenic hazards in karst areas: an introduction, M Parise and J Gunn • Sinkhole distribution based on pre-development mapping in urbanized Pinellas County, Florida, USA, R Brinkmann, K Wilson, N Elko, L D Seale, L Florea and H L Vacher • Natural and anthropogenic rock collapse over open caves, T Waltham and Z Lu • Sinkholes in Italy: first results on the inventory and analysis, S Nisio, G Caramanna G Ciotoli • Assessment of cover-collapse sinkholes in SW Sardinia (Italy), F Ardau, R Balia, M Bianco and J de Waele • Karst processes and slope instability: some experiences in the carbonate Apennine of Campania (southern Italy), A Santo, S del Prete, G di Crescenzo and M Rotella • Magnetic prospection as an efficient tool for doline detection: a case study in the central Ebro Basin (northern Spain), T Mochales, E L Pueyo, A M Casas and M A Soriano • Coastal karst geomorphosites at risk? A case study: the floods of 6-11 December 2004 in central-east Sardinia, A Cossu, J de Waele and F di Gregorio • Contributory area definition for groundwater source protection and hazard mitigation in carbonate aquifers, J Gunn • Rapid karstic bypass flow in the unsaturated zone of the Yorkshire chalk aquifer and implications for contaminant transport, S J L Allshorn, S H Bottrell, L J West and N E Odling • Stable isotopes in aqueous sulphate as tracers of natural and contaminant sulphate sources: a reconnaisance study of the Xingwen karst aquifer, Sichuan, China, S H Bottrell • Intrinsic vulnerability of the Alburni karst system (southern Italy), D Ducci • Evaluating the impact of quarrying on karst aquifers of Salento (southern Italy), M Della Rose, M Parise and G F Andriani • Natural and anthropogenic hazards in the karsts of Jamaica, M J Day • Biotic versus abiotic calcite formation on prehistoric cave paintings: the Arcy-sur-Cure 'Grande Grotte' (Yonne, France) case, E Chalmin, F d’Orlyé, L Zinger, L Charlet, R A Geremia, G Orial, M Menu, D Baffier and I Reiche