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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 evaluation of a Philips ammonium ion selective electrode (220/14/T)
529The greening of Grasmere: its plankton periodicity in 1988
530A strategic review of the petroleum refinery Industry Sector
531Guidelines for river corridor surveys in the NRA : February 1992. draft 3
532Second annual review of the Sid/Otter catchment management plan 1999
533Contribution of small streams to potential fish production in the Conwy catchment
534NRA strategy for reducing the concentration of pesticides in controlled waters
535Low-cost modifications of the Crump weir to improve fish passage
536'Sea Vigil' water quality monitoring : the Wash 1992-1993
537Second annual review of the Seaton, Looe and Fowey catchment management plan
538The Yarrow catchment : recommendations for statutory water quality objectives
539The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
540The National Rivers Authority employee attitude survey : summary
541The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
542Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
543Pesticides in the aquatic environment 1997 : executive summary
544Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
545Draft protocol for the derivation of Toxicity Based Consents
546The Loddon catchment, Thames : recommendations for statutory water quality objectives
547Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
548Second Coniston OS map related to the Seismic Survey 1983
549Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
550Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983