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626Land drainage byelaws 1981 and the Thames region flood defence byelaws 1991
627River quality in England and Wales : a report of the 1990 survey
628Snapshots of the environment : understanding coastal water quality
629The evaluation of EDT QSE 334 ammonium ion selective electrode (220/17/T)
630The evaluation of ingold ion selective ammonium electrode (220/23/T)
631Rivers of the Isle of Wight fact file
632The Influence of Variations in Flow on General Quality Assessment of Rivers
633Stratification in the Severn Estuary- Physical aspects and biological consequences
634The Mersey estuary : a report on environmental quality
635Catches of migratory fish in the River Don, Aberdeenshire
636Lakes, Ponds and Reservoirs in the Southern Region (NRA)
637The 1990 river and estuary classification survey of England and Wales
638The evaluation of an orion ammonium ion selective electrode (220/15/T)
639An Independent Review of the Defra/EA Research and Development Joint
640Anthropogenic Impacts on the Hydrology of Rivers and Lochs
641Dissemination of the Revitalised FEH Rainfall-runoff Method
642General guide to the prevention of water pollution
643Highway runoff: Effects of soluble pollutants on the ecology of receiving waters
644Life cycle assessment of disposable and reusable nappies in the UK
645Managing the social aspects of flooding: Synthesis Report
646Model For Investigating The Impacts Of Groundwater Abstraction
647National guidelines for the production of NRA regions 1990/91 regional plans
648Operational mechanisms for the protection and enhancement of headwaters
649Policy and practice for the protection of groundwater : regional appendix Welsh region
650Procurement legislation and the NRA : a brief guide