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651Guidelines for river corridor surveys in the NRA : February 1992. draft 3
652Second annual review of the Sid/Otter catchment management plan 1999
653Contribution of small streams to potential fish production in the Conwy catchment
654NRA strategy for reducing the concentration of pesticides in controlled waters
655The ecology and management of riverine trees : interim report
656Low-cost modifications of the Crump weir to improve fish passage
657Policy and practice for the protection of groundwater - Thames region appendix
658'Sea Vigil' water quality monitoring : the Wash 1992-1993
659Second annual review of the Seaton, Looe and Fowey catchment management plan
660The Yarrow catchment : recommendations for statutory water quality objectives
661Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
662The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
663Guidance on the use of Bioassays in Ecological Risk Assessment
664The National Rivers Authority employee attitude survey : summary
665The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
666Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
667Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
668Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
669The Louth coastal catchment management plan : final report
670Fine sediment deposition in the River Keer : geomorphological assessment
671Draft protocol for the derivation of Toxicity Based Consents
672The Loddon catchment, Thames : recommendations for statutory water quality objectives
673Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
674The flood of February 1990 : technical services flood monitoring report
675Sustainable drainage systems (SuDS) : an evaluation using the Natural Step framework