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626The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
627Guidance on the use of Bioassays in Ecological Risk Assessment
628The National Rivers Authority employee attitude survey : summary
629The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
630Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
631Pesticides in the aquatic environment 1997 : executive summary
632Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
633Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
634Fine sediment deposition in the River Keer : geomorphological assessment
635Draft protocol for the derivation of Toxicity Based Consents
636The Loddon catchment, Thames : recommendations for statutory water quality objectives
637Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
638The flood of February 1990 : technical services flood monitoring report
639Sustainable drainage systems (SuDS) : an evaluation using the Natural Step framework
640Policy and practice for the protection of groundwater : Southern region appendix
641Uses of the water environment: factsheet number six
642Flood alleviation proposals for Bakewell and Ashford in the Water
643An update on the Hexham flood alleviation scheme, Autumn 2006
644(Bilingual) Assessing the impact of dewatering on water resources
645Catches of Brown Trout in the River Don
646Environmental snapshot for the East of England [2000]
647Biodiversity strategy and action plan for the Environment Agency (Thames Region)
648Biological water quality monitoring in the Midlands region
649A natural assets register for the Sankey catchment. Volume 2
650Non-compliance with water quality objectives on the Croyde stream (upper catchment)