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501A desk study of the available information on wintering waterfowl feeding in the Wash, Lincolnshire and Norfolk
502A Study of the Composition of Collected Household Waste in the United Kingdom - with particular reference to packaging waste
503Rising groundwater levels in the chalk-basal sands aquifer of the Central London Basin. Progress report, March 1995
504Tributyltin in the aquatic environment : final report to the National Rivers Authority September 1990 to September 1992
505A report on the strategic stock assessment survey of the River Esk catchment 1994 with particular reference to salmonids
506An investigation of ecological change in the rivers Kennet and Lambourn. Progress report for the period April 1999-March 2000
507Report on the quality of bathing waters in Hampshire, Sussex, Kent and the Isle of Wight : 1992 bathing season
508Guidance notes for local planning authorities on the methods of protecting the water environment through development plans
509Report on Grayling research and production in the Anglian region of the National Rivers Authority, December 1988 to April 1989
510The development of biomanipulation techniques and control of phosphorus release from sediments (475/1/A) : LIFE project : restoration of the Norfolk Broads
511The application of toxicity-based criteria for the regulatory control of wastewater dicharges Response compendium March 1997
512Rising groundwater levels in the chalk-basal sands aquifer of the Central London Basin. Progress report, March 1996
513Preliminary modelling of water storage and transfers in the Anglian region : supporting documentation for the regional water resources strategy May 1993
514Continuous water quality monitoring results collected from the river Torridge at Cockshilhay and Beam Bridge for the EU UWWTD
515Water quality objectives: procedures used by the NRA for the purpose of surface waters river ecosystem) (classification) regulations 1994
516Mercury, methylmercury and copper in the River Yare, Norfolk : summary of a report to the National Rivers Authority, Anglian Region
517Second interim report on the environmental impacts of the drought on Yorkshire's rivers April 1995 to April 1996
518Interim report on the environmental impacts of the drought on Yorkshire rivers April 1995 to April 1996
519A report on the 1992 strategic stock assessment survey of the upper Eden catchment with particular reference to salmonids
520River Darent low flow alleviation. Annex 3 : plan for the Darent : report of the joint NRA/TWUL project team
521Conservation and recreation : the Wye challenge : towards a management strategy for the River Wye : summary report (bilingual)
522An assessment of the impact of Berkhamsted and Maple Lodge STWs on the Grand Union canal based on macroinvertebrate surveys
523An Assessment of Cormorant Depredation on Stillwater Coarse Fish Populations in the Lea and Colne Valleys of the Thames Catchment
524Water framework directive : guiding principles on the technical requirements (summary) : accompanying summary to the Environment Agency consultation document
525A biological investigation of the affects of discharges from Meldon quarry on the West Okemont River - 8/08/89 and 20/09/89