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526Guidelines for river corridor surveys in the NRA : February 1992. draft 3
527Contribution of small streams to potential fish production in the Conwy catchment
528NRA strategy for reducing the concentration of pesticides in controlled waters
529Low-cost modifications of the Crump weir to improve fish passage
530Policy and practice for the protection of floodplains
531Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
532The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
533Guidance on the use of Bioassays in Ecological Risk Assessment
534The National Rivers Authority employee attitude survey : summary
535The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
536Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
537Pesticides in the aquatic environment 1997 : executive summary
538Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
539The Louth coastal catchment management plan : final report
540Fine sediment deposition in the River Keer : geomorphological assessment
541Draft protocol for the derivation of Toxicity Based Consents
542Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
543Second Coniston OS map related to the Seismic Survey 1983
544Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
545Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
546Coniston OS map related to the Seismic Survey 1983
547The flood of February 1990 : technical services flood monitoring report
548Sustainable drainage systems (SuDS) : an evaluation using the Natural Step framework
549River basin planning and the Water Framework Directive
550The Adur and Ouse catchment abstraction management strategy : consultation document