| 51 | Biological report of the 1992 coastal and estuarine survey from Crosby to Glasson |
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| 52 | Biological report of the 1991 coastal and estuarine survey from Crosby to Glasson |
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| 53 | Macrophyte status of the Rivers Test and Itchen - Hampshire : summary report - October 1998 |
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| 54 | Regional river quality monitoring and surveillance : results of the 1990/1991 biological survey : draft report |
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| 55 | An audit of performance in the analysis of biological samples in 1999. Environment Agency : primary audit |
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| 56 | An audit of performance in the analysis of biological samples in 1999. Environment Agency : AQC audit |
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| 57 | A study to investigate and propose remedies for river quality problems in the Madford catchment |
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| 58 | Guidance on the Development of Typology and Classification Systems for Transitional and Coastal Waters |
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| 59 | Discharge monitoring in the Kennet catchment. Part 2 : ecological effects of fish farm discharges |
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| 60 | Monitoring the effects of a combined sewer overflow discharge to a small watercourse in South Wales |
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| 61 | Quantification of the relationship between effluent quality and biological quality : interim report for stage 1 |
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| 62 | Analysis of natural and polluted river communities in Great Britain- Progress report for the period April 1984- March 1988
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| 63 | Thames estuary benthic programme : a site by site report on the results of macroinvertebrate surveys undertaken during 1990-91 |
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| 64 | The development of macroinvertebrate keys using TWINSPAN classification : a manual for NRA biologists (001/10/W) : draft final report |
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| 65 | Torridge data report : biological monitoring of organic inputs to the study catchments using rapid biological assessment keys |
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| 66 | An audit of performance in the primary analysis of standard biological macro-invertebrate samples in 2001 : Environment Agency CEH Report Ref: COO 158/23 |
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