| 476 | Less sensitive areas and candidate high natural dispersion areas in the North West region |
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| 477 | Investigation into the frequency of storm overflow operation at Bradworthy sewage treatment works (1996) |
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| 478 | Microbiological examination of coastal waters in the North West : summary of results 1998 |
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| 479 | The Impact Of Grazing And Upland Management On Erosion And Runoff: Additional Information |
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| 480 | Old Bedford incorporating the Middle Level and Ouse Washes : consultation report - May 1997 |
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| 481 | Herbicides for use in or near the aquatic environment: Priorities for Environmental Quality Standards Development |
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| 482 | Impact assessment of Helston Sewage Treatment Works on water quality of the River Cober Loe Pool |
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| 483 | Effects of suspended solids on salmon (Salmo salar, L.) in the Parrett stuary, Somerset, Draft |
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| 484 | Improved monitoring for surface water quality : the development of a manual of best practice |
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| 485 | The River Babingley. Volume 1 : executive summary : a report for National Rivers Authority, Anglian Region |
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| 486 | The effect of ferric dosing of lakes on benthic invertebrates : first year report |
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| 487 | Water pollution incidents in England and Wales - 1990 : report of the National Rivers Authority |
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| 488 | Economic evaluation of inland fisheries: The economic impact of freshwater angling in England and Wales |
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| 489 | Demand for irrigation water (413/1/A) : progress report for the period August 1992 to January 1993 |
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| 490 | An audit of performance in the processing of macro-invertebrate samples in 1992 |
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| 491 | Annual review of the Colne, Upper Lee, North London and Roding, Beam and Ingerbourne catchments |
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| 492 | Hope Cove : non-compliance in 1998 with the European Community bathing water directive (76/160/EEC) |
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| 493 | The hydrological effects of demand management : project definition stage report : 28th May 1996 |
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| 494 | Biological river quality 1995 according to the general quality (GQA) scheme [map] : scale 1 : 750 000 |
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| 495 | NRA programme for the monitoring of water quality Parts 1 to 3 - November 1994 |
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| 496 | Regional river quality monitoring and surveillance : results of the 1990/1991 biological survey : draft report |
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| 497 | Catchment management plans : protecting and enhancing the water environment in an integrated manner |
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| 498 | Further investigation of the pilot borehole at Bean's Lane, Wortham (94/7/912) : September 1994 |
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| 499 | Two year aesthetic survey of beaches in the South West (1990 and 1991) |
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| 500 | Groundwater management in the North West: efficiency review and business plan: certificate in management |
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