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526Method for the assessment of river water quality using benthic macroinvertebrates
527Development of Operational and Policy Guidance on the Use of Hydrogen Peroxide
528The National Groundwater and Contaminated Land Centre (NGWCLC)
529The evaluation of a Philips ammonium ion selective electrode (220/14/T)
530The greening of Grasmere: its plankton periodicity in 1988
531A strategic review of the petroleum refinery Industry Sector
532Guidelines for river corridor surveys in the NRA : February 1992. draft 3
533NRA strategy for reducing the concentration of pesticides in controlled waters
534Low-cost modifications of the Crump weir to improve fish passage
535Policy and practice for the protection of floodplains
536'Sea Vigil' water quality monitoring : the Wash 1992-1993
537The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
538The National Rivers Authority employee attitude survey : summary
539The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
540Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
541Pesticides in the aquatic environment 1997 : executive summary
542Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
543The Louth coastal catchment management plan : final report
544Snapshots of the environment : a new environmental approach
545Draft protocol for the derivation of Toxicity Based Consents
546Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
547Second Coniston OS map related to the Seismic Survey 1983
548Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
549Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
550Coniston OS map related to the Seismic Survey 1983