| 5501 | A draft code of practice for analytical quality control in National Rivers Authority laboratories |
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| 5502 | Control samples for ph determination in low ionic strength waters |
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| 5503 | Proposals to introduce operator monitoring assessment for emissions to air from processes regulated under integrated pollution control : consultation paper |
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| 5504 | Cryptosporidium in drinking water : survey of occurrence. June 1991 |
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| 5505 | River Cober catchment river water quality classification 1990 |
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| 5506 | Developing Quality Assurance for Fish Counter Data - Phase 1: An Assessment of the Salmonid Fish Counter Network in England and Wales |
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| 5507 | Quality assurance for phytoplankton data |
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| 5508 | STREAM thematic network : standards, measurement, testing and research in environmental instrumentation and monitoring |
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| 5509 | Evaluation of a YSI-6000 submersible water quality monitor |
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| 5510 | Evaluation of an ELE/pHOX sub-logger submersible water quality monitor |
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| 5511 | Blue-green algal survey of Lower Clicker Quarry |
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| 5512 | Development of a field test kit for detection of blue-green algal toxins (348/02/A) : interim progress report |
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| 5513 | European collaboration to develop standard sediment toxicity test methods (396/4/T) : interim report |
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| 5514 | The application of toxicity-based criteria for the regulatory control of wastewater discharges: a consultation document |
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| 5515 | Acid Waters: Llyn Brianne Project- Project Record |
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| 5516 | Development of a field test kit for detection of blue-green algal toxins (348/01/A) : interim progress report |
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| 5517 | Some guidance on the use of digital environmental data |
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| 5518 | A review of the quality and status of the Suffolk and Essex estuaries and coastal waters : volume 1 : final draft |
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| 5519 | An evaluation of discharge and consent compliance policy : a blueprint for the future |
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| 5520 | An evaluation of discharge and consent compliance policy : a blueprint for the future : letters from respondents |
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| 5521 | An investigation into the effect of Farnham STW on the River Wey |
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| 5522 | An investigation into the effects of Alton sewage works on the River Wey North |
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| 5523 | An investigation of sewage on the beach at Porthcothan |
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| 5524 | Assessing and controlling the ecotoxicity of complex effluents |
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| 5525 | Assessment of (anti-) Oestrogenic and (anti-) Androgenic Activities of Final Effluents from Sewage Treatment Works |
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