| 551 | The evaluation of a Nico Elit 051 ammonium ion selective electrode (220/16/T) |
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| 552 | Guidance on the use of Bioassays in Ecological Risk Assessment |
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| 553 | The National Rivers Authority employee attitude survey : summary |
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| 554 | The Use of a Hydroacoustic Counter for Assessing Salmon Stocks |
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| 555 | Pesticides in the aquatic environment 1997 : executive summary |
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| 556 | Targeted Monitoring Programme for Pharmaceuticals in the Aquatic Environment |
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| 557 | Mercury and methylmercury in the river Yare, Norfolk (OI/420/8/A) |
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| 558 | Draft protocol for the derivation of Toxicity Based Consents |
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| 559 | The Loddon catchment, Thames : recommendations for statutory water quality objectives |
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| 560 | Assessment of the Impact of Nutrient Removal on Eutrophic Rivers |
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| 561 | Second Coniston OS map related to the Seismic Survey 1983 |
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| 562 | Note 2 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983 |
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| 563 | Note 1 by Professor Gerald Sargent regarding the Coniston Seismic Survey 1983 |
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| 564 | Coniston OS map related to the Seismic Survey 1983 |
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| 565 | (Bilingual) Assessing the impact of dewatering on water resources |
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| 566 | Catches of Brown Trout in the River Don |
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| 567 | Biological water quality monitoring in the Midlands region |
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| 568 | A natural assets register for the Sankey catchment. Volume 2 |
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| 569 | Non-compliance with water quality objectives on the Croyde stream (upper catchment) |
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| 570 | Bacteriological monitoring of freshwater rivers in the Thames Region 1995 |
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| 571 | Impact of breakwaters on the water quality of Sidmouth beach |
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| 572 | Bass fishing in the Fal estuary and coastal area |
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| 573 | Report on the survey of SBM handlers in Devon |
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| 574 | Enhancing the environment : 25 case studies from Thames Region |
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| 575 | Fish Guide 1997/98 A Guide to day ticket fisheries in the Midlands |
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