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551The evaluation of a Philips ammonium ion selective electrode (220/14/T)
552The greening of Grasmere: its plankton periodicity in 1988
553A strategic review of the petroleum refinery Industry Sector
554Guidelines for river corridor surveys in the NRA : February 1992. draft 3
555Contribution of small streams to potential fish production in the Conwy catchment
556NRA strategy for reducing the concentration of pesticides in controlled waters
557Low-cost modifications of the Crump weir to improve fish passage
558Policy and practice for the protection of groundwater - Thames region appendix
559Policy and practice for the protection of floodplains
560Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
561The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
562Guidance on the use of Bioassays in Ecological Risk Assessment
563The National Rivers Authority employee attitude survey : summary
564The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
565Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
566Pesticides in the aquatic environment 1997 : executive summary
567Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
568Fine sediment deposition in the River Keer : geomorphological assessment
569Snapshots of the environment : a new environmental approach
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