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501Mercury, methylmercury and copper in the River Yare, Norfolk : summary of a report to the National Rivers Authority, Anglian Region
502Second interim report on the environmental impacts of the drought on Yorkshire's rivers April 1995 to April 1996
503Interim report on the environmental impacts of the drought on Yorkshire rivers April 1995 to April 1996
504A report on the 1992 strategic stock assessment survey of the upper Eden catchment with particular reference to salmonids
505River Darent low flow alleviation. Annex 3 : plan for the Darent : report of the joint NRA/TWUL project team
506Conservation and recreation : the Wye challenge : towards a management strategy for the River Wye : summary report (bilingual)
507An assessment of the impact of Berkhamsted and Maple Lodge STWs on the Grand Union canal based on macroinvertebrate surveys
508An Assessment of Cormorant Depredation on Stillwater Coarse Fish Populations in the Lea and Colne Valleys of the Thames Catchment
509Water framework directive : guiding principles on the technical requirements (summary) : accompanying summary to the Environment Agency consultation document
510A biological investigation of the affects of discharges from Meldon quarry on the West Okemont River - 8/08/89 and 20/09/89
511An investigation into the bacterial water quality of the River Umber, N. Devon : December 1996 : DEV/WQ/14/96
512An investigation into the elevated BOD levels at Brocken Bridge (R30H001) on the Barnstaple Yeo [DEV/E/20/95]
513An investigation to determine if Great Torrington STW is the cause of elevated copper and zinc concentrations in the River Torridge
514Options for development of an enhanced team culture in the NRA, using the Welsh Regional Technical Department as an example
515A preliminary investigation into the extent of saline ingress into Curry Moor from the River Tone, January 1994
516Bioccumulation of halogenated compounds by limpets and fucoid seaweeds in the vicinity by the Black Rock sewage outfall, Weston-Super-Mare
517Modelling the contribution from non-agricultural sources to nitrate pollution in the Sor Brook (Thames Region) (UC 3134)
518A desk top study into the probable causes of poor water quality at Higher Hollacombe Farm (RO5K013) on the Hollacombe Lake
519Health effects of sea bathing (WMI 9021) - Phase III final report to the Department of the Environment
520Procedure for quality assurance for RIVPACS compatible macro-invertebrate samples analysed to the taxonomic level needed for the BMWP-score system
521Assessment of the Trophic Status of Rivers using Macrophytes - supporting documentation for evaluation of the Mean Trophic Rank
522An audit of performance in the AQC inspection of standard biological macro-invertebrate samples in 2002 : The Environment Agency (C00158/31)
523Biological investigation of the impact of Ivybridge sewage treatment works discharge to the River Erme, May 1991
524Final report of the controlled cohort investigations into the health effects of bathing in sewage contaminated coastal waters
525An investigation to determine the source of high levels of gamma-HCH in the Newlyn River during summer 1989