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551Method for the assessment of river water quality using benthic macroinvertebrates
552Development of Operational and Policy Guidance on the Use of Hydrogen Peroxide
553The National Groundwater and Contaminated Land Centre (NGWCLC)
554The evaluation of a Philips ammonium ion selective electrode (220/14/T)
555The greening of Grasmere: its plankton periodicity in 1988
556A strategic review of the petroleum refinery Industry Sector
557Guidelines for river corridor surveys in the NRA : February 1992. draft 3
558Contribution of small streams to potential fish production in the Conwy catchment
559NRA strategy for reducing the concentration of pesticides in controlled waters
560Low-cost modifications of the Crump weir to improve fish passage
561Policy and practice for the protection of floodplains
562The Yarrow catchment : recommendations for statutory water quality objectives
563Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
564The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
565Guidance on the use of Bioassays in Ecological Risk Assessment
566The National Rivers Authority employee attitude survey : summary
567The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
568Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
569Pesticides in the aquatic environment 1997 : executive summary
570Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
571Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
572Draft protocol for the derivation of Toxicity Based Consents
573The Loddon catchment, Thames : recommendations for statutory water quality objectives
574Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
575Second Coniston OS map related to the Seismic Survey 1983