28 September 1977 Noordwijkerhout Inear Amsterdaml The Netherlands Organized by the National Institute for Water Supply, Voorburg and the University of Amsterdam. Amsterdam and sponsored by the Commission of the European Communities, the U.S. Environmental Protection Agency, the Netherlands Ministry of Public Health and Environmental Hygiene and other organizations. Thirty papers on transport, transformation and biologi-
cal effects of aquatic pollutants, will be presented by invited speakers from 10 different countries. lnqumes to: lr. H, v. Lelp~eld. National Institute for Water Supply, P.O. Box 150. Leidschendam. The Netherlands.