| 526 | An Assessment of Cormorant Depredation on Stillwater Coarse Fish Populations in the Lea and Colne Valleys of the Thames Catchment |
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| 527 | 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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| 528 | An investigation into the bacterial water quality of the River Umber, N. Devon : December 1996 : DEV/WQ/14/96 |
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| 529 | An investigation into the elevated BOD levels at Brocken Bridge (R30H001) on the Barnstaple Yeo [DEV/E/20/95] |
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| 530 | 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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| 531 | Options for development of an enhanced team culture in the NRA, using the Welsh Regional Technical Department as an example |
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| 532 | A preliminary investigation into the extent of saline ingress into Curry Moor from the River Tone, January 1994 |
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| 533 | A report on the infaunal communities within Weston Bay in relation to the sewage outfall at Black Rock |
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| 534 | Bioccumulation of halogenated compounds by limpets and fucoid seaweeds in the vicinity by the Black Rock sewage outfall, Weston-Super-Mare |
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| 535 | Modelling the contribution from non-agricultural sources to nitrate pollution in the Sor Brook (Thames Region) (UC 3134) |
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| 536 | A desk top study into the probable causes of poor water quality at Higher Hollacombe Farm (RO5K013) on the Hollacombe Lake |
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| 537 | Health effects of sea bathing (WMI 9021) - Phase III final report to the Department of the Environment |
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| 538 | Procedure for quality assurance for RIVPACS compatible macro-invertebrate samples analysed to the taxonomic level needed for the BMWP-score system |
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| 539 | Assessment of the Trophic Status of Rivers using Macrophytes - supporting documentation for evaluation of the Mean Trophic Rank |
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| 540 | The Economics of No-Spray Zones - a Study of the Risks and Benefits of Pesticide No-Spray Restrictions |
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| 541 | Analysis of benthic macro-invertebrate samples collected by the NRA during 1989 and 1990 from various habitats in the River Delph |
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| 542 | Biological investigation of the impact of Ivybridge sewage treatment works discharge to the River Erme, May 1991 |
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| 543 | Final report of the controlled cohort investigations into the health effects of bathing in sewage contaminated coastal waters |
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| 544 | An investigation to determine the source of high levels of gamma-HCH in the Newlyn River during summer 1989 |
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| 545 | An investigation into high concentrations of atrazine in surface waters and the increase in maize production in the Otter valley |
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| 546 | River Habitat Quality the physical character of rivers and streams in the UK and Isle of Man |
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| 547 | Investigation of flow distribution in a fracture zone at the Stripa mine, using the radar method, results and interpretation |
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| 548 | Biosensors for environmental monitoring : a review of capabilities and strategies for the future : consultant's report to the NRA |
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| 549 | An assessment of the causes of non-compliance with river quality standards within the River Tiddy catchment (1989-1991) |
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| 550 | Assessment of the feasibility of using image analysis in the oyster embryo-larval development and daphnia magna growth tests |
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