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551First annual review of the Taw/Torridge estuary catchment management plan (1996)
552Suffolk estuarine strategies : Blyth estuary strategy : introduction to the strategy
553Method for the assessment of river water quality using benthic macroinvertebrates
554Development of Operational and Policy Guidance on the Use of Hydrogen Peroxide
555The National Groundwater and Contaminated Land Centre (NGWCLC)
556The evaluation of a Philips ammonium ion selective electrode (220/14/T)
557The greening of Grasmere: its plankton periodicity in 1988
558A strategic review of the petroleum refinery Industry Sector
559Guidelines for river corridor surveys in the NRA : February 1992. draft 3
560NRA strategy for reducing the concentration of pesticides in controlled waters
561Low-cost modifications of the Crump weir to improve fish passage
562Policy and practice for the protection of floodplains
563'Sea Vigil' water quality monitoring : the Wash 1992-1993
564Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
565The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
566Guidance on the use of Bioassays in Ecological Risk Assessment
567The National Rivers Authority employee attitude survey : summary
568The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
569Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
570Pesticides in the aquatic environment 1997 : executive summary
571Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
572The Louth coastal catchment management plan : final report
573Snapshots of the environment : a new environmental approach
574Draft protocol for the derivation of Toxicity Based Consents
575Assessment of the Impact of Nutrient Removal on Eutrophic Rivers