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676Guidelines for river corridor surveys in the NRA : February 1992. draft 3
677Contribution of small streams to potential fish production in the Conwy catchment
678NRA strategy for reducing the concentration of pesticides in controlled waters
679The ecology and management of riverine trees : interim report
680Low-cost modifications of the Crump weir to improve fish passage
681Policy and practice for the protection of floodplains
682'Sea Vigil' water quality monitoring : the Wash 1992-1993
683The Yarrow catchment : recommendations for statutory water quality objectives
684Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
685The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
686Guidance on the use of Bioassays in Ecological Risk Assessment
687The National Rivers Authority employee attitude survey : summary
688The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
689Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
690Pesticides in the aquatic environment 1997 : executive summary
691Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
692Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
693Fine sediment deposition in the River Keer : geomorphological assessment
694Draft protocol for the derivation of Toxicity Based Consents
695The Loddon catchment, Thames : recommendations for statutory water quality objectives
696Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
697Second Coniston OS map related to the Seismic Survey 1983
698Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
699Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
700Coniston OS map related to the Seismic Survey 1983