| 601 | River water quality in the Midlands 1998 |
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| 602 | The Effect of Atrazine Exposure on the Timing of Salmon (Salmo salar L.) Smolt Emigration |
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| 603 | Fish health indices as a marker of surface water quality (229/2/A) |
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| 604 | Newby Beck Outlet monthly grab samples |
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| 605 | Thackthwaite Beck Outlet monthly grab samples |
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| 606 | Quality assurance and quality control protocols adopted by Hampshire Avon DTC consortium |
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| 607 | Thackthwaite Beck Control Sub-Catchment Monthly Grab Samples |
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| 608 | Newby Beck Control Sub-Catchment Turbidity |
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| 609 | Thackthwaite Beck Control Sub-Catchment Turbidity |
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| 610 | The Mersey Estuary 1992 surveys : summary of results |
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| 611 | 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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| 612 | Health effects of sea bathing phase 1 - pilot studies at langland bay 1989 |
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| 613 | Help safeguard the Torridge (leaflet) |
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| 614 | Wyre Estuary : summary of sampling locations and requirements |
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| 615 | Further surveys to elucidate the distribution of the fine-lined pea mussel Pisidium tenuilineatum Stelfox, 1918 |
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| 616 | Contaminated land and the water environment : report of the National Rivers Authority |
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| 617 | An investigation to determine the water quality of Churchstanton Stream |
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| 618 | Discharge consents and compliance : the NRA's approach to control of discharges to water |
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| 619 | Hydropower developments and the National Rivers Authority |
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| 620 | Proposals for statutory water quality objectives : report of the National Rivers Authority |
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| 621 | Regional water quality monitoring and surveillance programme for 1993 : tidal waters monitoring and surveillance : final draft report |
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| 622 | Summary report on environmental developments : volume 2 : legislation and European practice : November 1998 - May 1989 |
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| 623 | Summary report on environmental developments : volume 3 : legislation and European practice : June 1989 to March 1990 |
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| 624 | National Rivers Authority/Po River Basin Authority collaboration programme : improved monitoring systems for river water quality : secretariat meeting, Parma, 13-15 December 1995 : programme and briefing notes |
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| 625 | Conservation in the Severn-Trent Region (NRA Severn-Trent 57)
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