576 | The National Groundwater and Contaminated Land Centre (NGWCLC) |
577 | The evaluation of a Philips ammonium ion selective electrode (220/14/T) |
578 | A strategic review of the petroleum refinery Industry Sector |
579 | Guidelines for river corridor surveys in the NRA : February 1992. draft 3 |
580 | Second annual review of the Sid/Otter catchment management plan 1999 |
581 | Contribution of small streams to potential fish production in the Conwy catchment |
582 | NRA strategy for reducing the concentration of pesticides in controlled waters |
583 | The ecology and management of riverine trees : interim report |
584 | Low-cost modifications of the Crump weir to improve fish passage |
585 | Policy and practice for the protection of groundwater - Thames region appendix |
586 | Policy and practice for the protection of floodplains |
587 | Second annual review of the Seaton, Looe and Fowey catchment management plan |
588 | Leachate Migration Through The Triassic Sandstones At Burntstump Landfill And Elsewhere |
589 | The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T) |
590 | Guidance on the use of Bioassays in Ecological Risk Assessment |
591 | The National Rivers Authority employee attitude survey : summary |
592 | The Use of a Hydroacoustic Counter for Assessing Salmon Stocks |
593 | Geochemical process modelling : progress report for the period Jan - March 1993 (0295/11/A) |
594 | Pesticides in the aquatic environment 1997 : executive summary |
595 | Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment |
596 | Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A) |
597 | Draft protocol for the derivation of Toxicity Based Consents |
598 | Second Coniston OS map related to the Seismic Survey 1983 |
599 | Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983 |
600 | Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983 |