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651Guidelines for river corridor surveys in the NRA : February 1992. draft 3
652Contribution of small streams to potential fish production in the Conwy catchment
653NRA strategy for reducing the concentration of pesticides in controlled waters
654The ecology and management of riverine trees : interim report
655Low-cost modifications of the Crump weir to improve fish passage
656Policy and practice for the protection of groundwater - Thames region appendix
657Policy and practice for the protection of floodplains
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)
667Pesticides in the aquatic environment 1997 : executive summary
668Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
669Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
670The Louth coastal catchment management plan : final report
671Fine sediment deposition in the River Keer : geomorphological assessment
672Snapshots of the environment : a new environmental approach
673Draft protocol for the derivation of Toxicity Based Consents
674Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
675Second Coniston OS map related to the Seismic Survey 1983