576 | Contribution of small streams to potential fish production in the Conwy catchment |
577 | NRA strategy for reducing the concentration of pesticides in controlled waters |
578 | Low-cost modifications of the Crump weir to improve fish passage |
579 | Policy and practice for the protection of floodplains |
580 | The Yarrow catchment : recommendations for statutory water quality objectives |
581 | Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere |
582 | The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T) |
583 | Guidance on the use of Bioassays in Ecological Risk Assessment |
584 | The National Rivers Authority employee attitude survey : summary |
585 | The Use of a Hydroacoustic Counter for Assessing Salmon Stocks |
586 | Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A) |
587 | Pesticides in the aquatic environment 1997 : executive summary |
588 | Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment |
589 | Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A) |
590 | Draft protocol for the derivation of Toxicity Based Consents |
591 | The Loddon catchment, Thames : recommendations for statutory water quality objectives |
592 | Assessment of the Impact of Nutrient Removal on Eutrophic Rivers |
593 | Second Coniston OS map related to the Seismic Survey 1983 |
594 | Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983 |
595 | Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983 |
596 | Coniston OS map related to the Seismic Survey 1983 |
597 | Policy and practice for the protection of groundwater : Southern region appendix |
598 | (Bilingual) Assessing the impact of dewatering on water resources |
599 | Catches of Brown Trout in the River Don |
600 | Biological water quality monitoring in the Midlands region |