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551Development of Operational and Policy Guidance on the Use of Hydrogen Peroxide
552The National Groundwater and Contaminated Land Centre (NGWCLC)
553The evaluation of a Philips ammonium ion selective electrode (220/14/T)
554The greening of Grasmere: its plankton periodicity in 1988
555A strategic review of the petroleum refinery Industry Sector
556Guidelines for river corridor surveys in the NRA : February 1992. draft 3
557Contribution of small streams to potential fish production in the Conwy catchment
558NRA strategy for reducing the concentration of pesticides in controlled waters
559Low-cost modifications of the Crump weir to improve fish passage
560'Sea Vigil' water quality monitoring : the Wash 1992-1993
561Second annual review of the Seaton, Looe and Fowey catchment management plan
562The Yarrow catchment : recommendations for statutory water quality objectives
563The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
564The National Rivers Authority employee attitude survey : summary
565The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
566Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
567Pesticides in the aquatic environment 1997 : executive summary
568Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
569The Louth coastal catchment management plan : final report
570Draft protocol for the derivation of Toxicity Based Consents
571Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
572Second Coniston OS map related to the Seismic Survey 1983
573Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
574Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
575Coniston OS map related to the Seismic Survey 1983