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526Land drainage byelaws 1981 and the Thames region flood defence byelaws 1991
527River quality in England and Wales : a report of the 1990 survey
528Snapshots of the environment : understanding coastal water quality
529The evaluation of EDT QSE 334 ammonium ion selective electrode (220/17/T)
530The evaluation of ingold ion selective ammonium electrode (220/23/T)
531Rivers of the Isle of Wight fact file
532Stratification in the Severn Estuary- Physical aspects and biological consequences
533The Mersey estuary : a report on environmental quality
534'Sea Vigil' water quality monitoring : the East coast 1992-1993
535Lakes, Ponds and Reservoirs in the Southern Region (NRA)
536The 1990 river and estuary classification survey of England and Wales
537The evaluation of an orion ammonium ion selective electrode (220/15/T)
538An Independent Review of the Defra/EA Research and Development Joint
539Anthropogenic Impacts on the Hydrology of Rivers and Lochs
540Dissemination of the Revitalised FEH Rainfall-runoff Method
541General guide to the prevention of water pollution
542Guidance on the use of Soil Screening Values for Ecological Risk Assessment
543Highway runoff: Effects of soluble pollutants on the ecology of receiving waters
544Life cycle assessment of disposable and reusable nappies in the UK
545Managing the social aspects of flooding: Synthesis Report
546National guidelines for the production of NRA regions 1990/91 regional plans
547Operational mechanisms for the protection and enhancement of headwaters
548Policy and practice for the protection of groundwater : regional appendix Welsh region
549Procurement legislation and the NRA : a brief guide
550Strategic review of development and flood risk : the River Welland catchment