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601A strategic review of the petroleum refinery Industry Sector
602Guidelines for river corridor surveys in the NRA : February 1992. draft 3
603Contribution of small streams to potential fish production in the Conwy catchment
604NRA strategy for reducing the concentration of pesticides in controlled waters
605The ecology and management of riverine trees : interim report
606Low-cost modifications of the Crump weir to improve fish passage
607Policy and practice for the protection of groundwater - Thames region appendix
608Policy and practice for the protection of floodplains
609'Sea Vigil' water quality monitoring : the Wash 1992-1993
610The Yarrow catchment : recommendations for statutory water quality objectives
611Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
612The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
613Guidance on the use of Bioassays in Ecological Risk Assessment
614The National Rivers Authority employee attitude survey : summary
615The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
616Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
617Pesticides in the aquatic environment 1997 : executive summary
618Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
619Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
620The Louth coastal catchment management plan : final report
621Fine sediment deposition in the River Keer : geomorphological assessment
622Snapshots of the environment : a new environmental approach
623Draft protocol for the derivation of Toxicity Based Consents
624Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
625Second Coniston OS map related to the Seismic Survey 1983