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651Development of Operational and Policy Guidance on the Use of Hydrogen Peroxide
652The evaluation of a Philips ammonium ion selective electrode (220/14/T)
653The greening of Grasmere: its plankton periodicity in 1988
654A strategic review of the petroleum refinery Industry Sector
655Guidelines for river corridor surveys in the NRA : February 1992. draft 3
656NRA strategy for reducing the concentration of pesticides in controlled waters
657The ecology and management of riverine trees : interim report
658Low-cost modifications of the Crump weir to improve fish passage
659Policy and practice for the protection of groundwater - Thames region appendix
660'Sea Vigil' water quality monitoring : the Wash 1992-1993
661The Yarrow catchment : recommendations for statutory water quality objectives
662Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere
663The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
664Guidance on the use of Bioassays in Ecological Risk Assessment
665The National Rivers Authority employee attitude survey : summary
666Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
667Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
668Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A)
669Fine sediment deposition in the River Keer : geomorphological assessment
670Draft protocol for the derivation of Toxicity Based Consents
671The Loddon catchment, Thames : recommendations for statutory water quality objectives
672Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
673Second Coniston OS map related to the Seismic Survey 1983
674Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
675Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983