Jo De Waele (*), Francesco Ferrarese (**), Darryl E. Granger (º) & Francesco Sauro (*)
(*) Italian Institute of Speleology, University of Bologna, Via Zamboni 67, 40127 Bologna, Italy. E-mail: jo.dewaele@unibo.it; sauro.francesco@libero.it
(**) Department of Historical, Geographical and Antiquity Studies, Laboratory Informatics-GIS, University of Padua, Via del Santo 26, 35123 Padova, Italy. E-mail: francesco.ferrarese@unipd.it
(º) Department of Earth and Atmospheric Sciences, Purdue University, Civil Engineering Building, Room 3277 A, 550 Stadium Mall Drive, West Lafayette, IN 47907-2051, USA. E-mail: dgranger@purdue.edu