This book is a collection of papers presented at the 2nd International River Quality Symposium. The papers give case studies of the quality of rivers in different parts of the world, focusing particularly on the polluted Vistula River in Poland and the revived Will amette River in Oregon, USA which was the subject of a major cleaning operation in the 1970s. The book provides valuable information on the quality of rivers in Eastern Europe, particulary Poland. It is timely since, with the collapse of communism, Eastern European countries are faced with tackling huge environmental problems created by the lack of investment in environmental technology. The situation in Poland is contrasted with the USA and UK where water pollution problems have largely been overcome.