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676Guidelines for river corridor surveys in the NRA : February 1992. draft 3
677Second annual review of the Sid/Otter catchment management plan 1999
678Contribution of small streams to potential fish production in the Conwy catchment
679NRA strategy for reducing the concentration of pesticides in controlled waters
680The ecology and management of riverine trees : interim report
681Low-cost modifications of the Crump weir to improve fish passage
682Policy and practice for the protection of groundwater - Thames region appendix
683Policy and practice for the protection of floodplains
684'Sea Vigil' water quality monitoring : the Wash 1992-1993
685Second annual review of the Seaton, Looe and Fowey catchment management plan
686The Yarrow catchment : recommendations for statutory water quality objectives
687Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
688The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
689Guidance on the use of Bioassays in Ecological Risk Assessment
690The National Rivers Authority employee attitude survey : summary
691The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
692Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
693Pesticides in the aquatic environment 1997 : executive summary
694Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
695The Louth coastal catchment management plan : final report
696Fine sediment deposition in the River Keer : geomorphological assessment
697Snapshots of the environment : a new environmental approach
698Draft protocol for the derivation of Toxicity Based Consents
699The Loddon catchment, Thames : recommendations for statutory water quality objectives
700Assessment of the Impact of Nutrient Removal on Eutrophic Rivers