| 6401 | River Par and Crinnis catchment river water quality classification 1990 |
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| 6402 | River Par and Crinnis catchment river water quality classification 1991 |
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| 6403 | St Austell River and south Cornwall coastal streams catchment river water quality classification 1990 |
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| 6404 | The identification and investigation of a dinoflagellate bloom in Mounts Bay, Cornwall |
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| 6405 | A draft code of practice for analytical quality control in National Rivers Authority laboratories |
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| 6406 | Control samples for ph determination in low ionic strength waters |
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| 6407 | Proposals to introduce operator monitoring assessment for emissions to air from processes regulated under integrated pollution control : consultation paper |
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| 6408 | 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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| 6409 | Quality assurance for phytoplankton data |
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| 6410 | Quality in Corporate Planning 1993 |
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| 6411 | STREAM thematic network : standards, measurement, testing and research in environmental instrumentation and monitoring |
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| 6412 | Annual N2O measurements and associated data: AC0213, Devon, 2012 |
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| 6413 | Evaluation of a YSI-6000 submersible water quality monitor |
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| 6414 | Evaluation of an ELE/pHOX sub-logger submersible water quality monitor |
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| 6415 | Blue-green algal survey of Lower Clicker Quarry |
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| 6416 | Development of a field test kit for detection of blue-green algal toxins (348/02/A) : interim progress report |
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| 6417 | European collaboration to develop standard sediment toxicity test methods (396/4/T) : interim report |
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| 6418 | Atlantic Salmon Trust Winter Journal 2005/2006 |
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| 6419 | Acid Waters: Llyn Brianne Project- Project Record |
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| 6420 | Development of a field test kit for detection of blue-green algal toxins (348/01/A) : interim progress report |
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| 6421 | Some guidance on the use of digital environmental data |
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| 6422 | A review of the quality and status of the Suffolk and Essex estuaries and coastal waters : volume 1 : final draft |
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| 6423 | Definition of terms used in the assessment information management system (AIMS) : guidance note 5 |
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| 6424 | An investigation into the effect of Farnham STW on the River Wey |
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| 6425 | An investigation into the effects of Alton sewage works on the River Wey North |
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