| 5501 | An assessment of mercury contamination in the Red River catchment : final draft report |
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| 5502 | Red River (R23A003) EC Dangerous Substance Directive failure 1993 : final draft report |
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| 5503 | Mouth of a river lamprey, |
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| 5504 | Red River : catchment action plan |
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| 5505 | Severn Trent Region Plan Summary 1991/1992 |
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| 5506 | Red River, Portreath, Bolingey and Perranporth catchment river water quality classification 1990 |
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| 5507 | Red River catchment river water quality classification 1991 |
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| 5508 | East Sussex Rother catchment management plan : action plan |
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| 5509 | Wastewater disinfection field trials (231/4/SW) |
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| 5510 | 1997 general quality assessment (GQA) and river ecosystem (RE) non-compliance : Devon area |
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| 5511 | A biological investigation of the affects of discharges from Meldon quarry on the West Okemont River - 8/08/89 and 20/09/89 |
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| 5512 | An investigation into possible causes of poor water quality at Blakewell Bridge (R30A001) on the Bradiford Water |
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| 5513 | An investigation into possible causes of poor water quality at Nymphayes Bridge (R30D009) on the Gissage Lake |
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| 5514 | Water quality monitoring locations 1992 |
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| 5515 | An investigation into the bacterial water quality of the River Umber, N. Devon : December 1996 : DEV/WQ/14/96 |
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| 5516 | An investigation into the elevated BOD levels at Brocken Bridge (R30H001) on the Barnstaple Yeo [DEV/E/20/95] |
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| 5517 | An investigation to determine if Deep Moor Landfill Site is causing an impact downstream in the Peagham Stream |
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| 5518 | An investigation to determine if Great Torrington STW is the cause of elevated copper and zinc concentrations in the River Torridge |
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| 5519 | NRA Anglian Region Plan Summary 1991/1992 |
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| 5520 | An investigation to determine if South Molton STW is the cause of elevated copper and zinc concentrations downstream in the River Mole [DEV/E/18/95] |
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| 5521 | Assessment of the impact of discharges from Meldon Quarry on the water quality of the West Okement River |
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| 5522 | Bideford fine screen outfall post scheme appraisal |
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| 5523 | Water quality report 1992 |
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| 5524 | Datchet, Wraysbury, Staines and Chertsey flood study : aquatic biology. Part 2 : a survey of the wetland vegetation and aquatric macroinvertebrates of the Abbey River and Chertsey Bourne |
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| 5525 | Options for development of an enhanced team culture in the NRA, using the Welsh Regional Technical Department as an example |
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