IUFRO symposium - units 6.07.04 'Ecological history' and 8.07.00 'Biodiversity 13-15 January 2003 Catholic University of Leuven, Belgium.
http://www.agr.kuleuven.ac.be/lbh/lbnl/forestbiodiv
Mine Water And The Environment: Environmental impacts of mining and mines closure; Katowice - Ustron, Poland ; 11.15. September 2000
http://www.geo.tu-freiberg.de/~cwolke/IMWA/Cong2000.htm
Water resources, drinking and industrial water supply. Technologies and equipment, control and testing instruments. Waste utilization and storage. St.Petersburg, Russia.
http://www.restec.ru/aquaterra