| 501 | Devon area internal report - further investigations into pipe discharges in the Lower Teign estuary |
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| 502 | Alleviation of low flow studies : the River Avon and its tributaries near Malmesbury : towards a solution |
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| 503 | A report on water quality issues within the Midford Brook catchment - June 1996 |
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| 504 | National marine baseline survey 1995 : littoral cell 11 : Great Orme to the Solway Firth |
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| 505 | Investigation into the frequency of storm overflow operation at Bradworthy sewage treatment works (1996) |
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| 506 | Microbiological examination of coastal waters in the North West : summary of results 1998 |
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| 507 | Report on the By Brook low flow investigations : October 2001 : volume 2 : (figures, maps and appendices) |
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| 508 | Bathing water quality in England and Wales in 1993 : report of the National Rivers Authority |
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| 509 | Water pollution incidents in England and Wales - 1993 : report of the National Rivers Authority |
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| 510 | The Wandle, Beverley Brook, Hogsmill catchment management plan : consultation report summary : November 1994 |
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| 511 | The distribution of PCDDS and PCDFS in surface freshwater systems 2nd Interim Progress Report - February 1993 |
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| 512 | A study to investigate and propose remedies for river quality problems in the Madford catchment |
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| 513 | Regional river quality monitoring and surveillance : results of the 1990/1991 biological survey : draft report |
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| 514 | Impact assessment of Meldon quarry on water quality in the West Okement river |
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| 515 | R and D Strategy to Support Implementation of the Water Framework Directive - Preliminary Scoping Report |
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| 516 | The government's policy for a public regulatory body in a privatised water industry |
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| 517 | Less sensitive areas and candidate high natural dispersion areas in the North West region |
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| 518 | Water pollution incidents in England and Wales - 1990 : report of the National Rivers Authority |
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| 519 | The Influence of Variations in Flow on General Quality Assessment of Rivers - Summary Document |
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| 520 | Annual classification of river water quality 1992 : numbers of samples exceeding the quality standard |
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| 521 | Water pollution incidents in England and Wales 1991 : report of the National Rivers Authority |
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| 522 | The Impact Of Grazing And Upland Management On Erosion And Runoff: Additional Information |
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| 523 | Extending Rutland yield analysis to 1933 : supporting documentation for the regional water resources strategy |
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| 524 | Investigation into the intermittent failure of Wembury Beach to comply with EC bathing water |
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| 525 | The River Babingley. Volume 1 : executive summary : a report for National Rivers Authority, Anglian Region |
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