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576Contribution of small streams to potential fish production in the Conwy catchment
577NRA strategy for reducing the concentration of pesticides in controlled waters
578The ecology and management of riverine trees : interim report
579Low-cost modifications of the Crump weir to improve fish passage
580Policy and practice for the protection of groundwater - Thames region appendix
581Policy and practice for the protection of floodplains
582Second annual review of the Seaton, Looe and Fowey catchment management plan
583Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
584The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
585Guidance on the use of Bioassays in Ecological Risk Assessment
586The National Rivers Authority employee attitude survey : summary
587The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
588Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
589Pesticides in the aquatic environment 1997 : executive summary
590Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
591Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
592Draft protocol for the derivation of Toxicity Based Consents
593Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
594Second Coniston OS map related to the Seismic Survey 1983
595Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
596Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
597Coniston OS map related to the Seismic Survey 1983
598The flood of February 1990 : technical services flood monitoring report
599Sustainable drainage systems (SuDS) : an evaluation using the Natural Step framework
600Uses of the water environment: factsheet number six