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4176Non-ferrous metals : supplementary guidance
4177Investigation into farm pollution at Wheddon Cross (1999)
4178Domesday to the dawn of the new millennium : 900 years of the Don Fishery
4179Lagerheimia,
4180Tolypothrix,
4181Historic changes in the Upper River Ehen Catchment- Summary
4182Metallothionein in eels from the Thames Estuary : an indicator of environmental quality
4183Weather data: AC0111, Cambridgeshire, 2009
4184West Midlands Stour : consultation report
4185Geochemical process modelling : interim report (0295/2/A)
4186Species Management in Aquatic Habitats Compendium of Project Outputs - Research and Survey Reports on Non-Mullusc Species
4187Fisheries technical report : Devon area report : River Taw fisheries survey 1996
4188Draparnaldia,
4189Synura,
4190Darwell Transfer Scheme. Final Report Part III. Water quality in the Darwell Reservoir
4191Herbarium Image: Stachys officinalis
4192Water pollution incidents in England and Wales 1991 : report of the National Rivers Authority
4193Validation of Diatoms as Proxys for Phytobenthos When Assessing Ecological Status in Lakes
4194The extent of phosphorus release in the Norfolk Broads
4195River Exe catchment river water quality classification 1991
4196Controls on emissions from coal and oil fired power stations : the agency's decision following its 1999 public consultation on its proposed controls
4197Steady-state particle tracking in the object-orientated regional groundwater model ZOOMQ3D
4198Wensum DTC General information - Supporting Document Monitoring Kiosk M
4199NRA policy implementation guidance note no. 5 : control of pollution (silage, slurry and agricultural fuel oil) regulations 1991
4200General introduction to the Water Framework Directive