This text, based on an international symposium held in 1994, covers geosynthetic clay liners (GCL), a new type of geosynthetic material which is a blend of natural soil and geosynthetics in the form of a composite barrier-system. Currently available as wide-width, factory-manufactured products, environmental applications have been a major use of GCL. They have been used as landfill liners, landfill covers, liquid impoundment liners, secondary containment liners for storage tanks and geomembrane protection layers. They have been deployed by themselves or as a composite system with an overlying geomembrane. Transport applications of GCL as tunnel liners have also been contemplated, as has their use as corewalls within earth dams.Gartung, Erwin is the author of 'Geosynthetic Clay Liners Proceedings of an International Symposium, Nurnberg, 14-15 April 1994' with ISBN 9789054105190 and ISBN 9054105194.