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551A strategic review of the petroleum refinery Industry Sector
552Guidelines for river corridor surveys in the NRA : February 1992. draft 3
553Contribution of small streams to potential fish production in the Conwy catchment
554NRA strategy for reducing the concentration of pesticides in controlled waters
555Low-cost modifications of the Crump weir to improve fish passage
556Policy and practice for the protection of groundwater - Thames region appendix
557Policy and practice for the protection of floodplains
558Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
559The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
560Guidance on the use of Bioassays in Ecological Risk Assessment
561The National Rivers Authority employee attitude survey : summary
562The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
563Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
564Pesticides in the aquatic environment 1997 : executive summary
565Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
566The Louth coastal catchment management plan : final report
567Fine sediment deposition in the River Keer : geomorphological assessment
568Snapshots of the environment : a new environmental approach
569Draft protocol for the derivation of Toxicity Based Consents
570Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
571Second Coniston OS map related to the Seismic Survey 1983
572Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
573Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
574Coniston OS map related to the Seismic Survey 1983
575The flood of February 1990 : technical services flood monitoring report