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626River quality in England and Wales : a report of the 1990 survey
627Snapshots of the environment : understanding coastal water quality
628The evaluation of EDT QSE 334 ammonium ion selective electrode (220/17/T)
629The evaluation of ingold ion selective ammonium electrode (220/23/T)
630Rivers of the Isle of Wight fact file
631The Influence of Variations in Flow on General Quality Assessment of Rivers
632Stratification in the Severn Estuary- Physical aspects and biological consequences
633'Sea Vigil' water quality monitoring : the East coast 1992-1993
634Catches of migratory fish in the River Don, Aberdeenshire
635Stream survey and assessment in the Ashford and Folkestone areas
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
643Guidance on the use of Soil Screening Values for Ecological Risk Assessment
644Highway runoff: Effects of soluble pollutants on the ecology of receiving waters
645Life cycle assessment of disposable and reusable nappies in the UK
646Managing the social aspects of flooding: Synthesis Report
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