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676Guidelines for river corridor surveys in the NRA : February 1992. draft 3
677Second annual review of the Sid/Otter catchment management plan 1999
678Contribution of small streams to potential fish production in the Conwy catchment
679NRA strategy for reducing the concentration of pesticides in controlled waters
680Low-cost modifications of the Crump weir to improve fish passage
681Policy and practice for the protection of groundwater - Thames region appendix
682Policy and practice for the protection of floodplains
683Second annual review of the Seaton, Looe and Fowey catchment management plan
684The Yarrow catchment : recommendations for statutory water quality objectives
685The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T)
686The National Rivers Authority employee attitude survey : summary
687The Use of a Hydroacoustic Counter for Assessing Salmon Stocks
688Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A)
689Pesticides in the aquatic environment 1997 : executive summary
690Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment
691Fine sediment deposition in the River Keer : geomorphological assessment
692Snapshots of the environment : a new environmental approach
693Draft protocol for the derivation of Toxicity Based Consents
694The Loddon catchment, Thames : recommendations for statutory water quality objectives
695Assessment of the Impact of Nutrient Removal on Eutrophic Rivers
696Second Coniston OS map related to the Seismic Survey 1983
697Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
698Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983
699Coniston OS map related to the Seismic Survey 1983
700The flood of February 1990 : technical services flood monitoring report