1. Report of a visit by A.G. Boon to Canada and the USA to investigate the use of wetlands for the treatment of wastewater (8–28 March 1986);Boon,1986
2. Report of a visit by members and staff of WRc to Germany (GFR) to investigate the root zone method for treatment of wastewaters;Boon,1986
3. The use of aquatic macrophytes in water-pollution control;Brix;Ambio,1989
4. Sewage treatment by reed bed systems;Cooper;J. Inst. Wat. Environ. Man.,1989
5. De Jong, J. and Kok, T. (1978). The purification of wastewater and effluents using marsh vegetations and soils. Proc. EWRS 5th Symp. on Aquatic Weeds, 135–142.