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626Method for the assessment of river water quality using benthic macroinvertebrates
627Development of Operational and Policy Guidance on the Use of Hydrogen Peroxide
628The National Groundwater and Contaminated Land Centre (NGWCLC)
629The evaluation of a Philips ammonium ion selective electrode (220/14/T)
630The greening of Grasmere: its plankton periodicity in 1988
631A strategic review of the petroleum refinery Industry Sector
632Contribution of small streams to potential fish production in the Conwy catchment
633NRA strategy for reducing the concentration of pesticides in controlled waters
634The ecology and management of riverine trees : interim report
635Low-cost modifications of the Crump weir to improve fish passage
636Policy and practice for the protection of groundwater - Thames region appendix
637Policy and practice for the protection of floodplains
638'Sea Vigil' water quality monitoring : the Wash 1992-1993
639Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
640The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
641Guidance on the use of Bioassays in Ecological Risk Assessment
642The National Rivers Authority employee attitude survey : summary
643The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
644Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
645Pesticides in the aquatic environment 1997 : executive summary
646Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
647Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
648The Louth coastal catchment management plan : final report
649Fine sediment deposition in the River Keer : geomorphological assessment
650Snapshots of the environment : a new environmental approach