| 501 | Biological river quality 1995 according to the general quality (GQA) scheme [map] : scale 1 : 750 000 |
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| 502 | Further investigation of the pilot borehole at Bean's Lane, Wortham (94/7/912) : September 1994 |
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| 503 | Water pollution incidents in England and Wales - 1993 : report of the National Rivers Authority |
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| 504 | Water pollution incidents in England and Wales 1991 : report of the National Rivers Authority |
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| 505 | YSI, turbidity and stage data for the Wensum Demonstration Test Catchment's monitoring kiosk B in 2011 |
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| 506 | Manual for the use of herbicides in or near water : January 1993 : final draft report |
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| 507 | An assessment of mercury contamination in the Red River catchment : final draft report |
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| 508 | Report on the By Brook low flow investigations : October 2001 : volume 1 : report |
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| 509 | Linking hydrology and ecology : River Wissey : Annex B aquatic macrophytes of the River Wissey |
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| 510 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk A |
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| 511 | The development of a portable battery-powered telemetry system for use in water quality investigations |
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| 512 | Impact assessment of Meldon quarry on water quality in the West Okement river |
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| 513 | River Meavy salmon and sea trout populations : assessment of the impact of flows |
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| 514 | Routine laboratory water sample data for the Wensum Demonstration Test Catchment's monitoring kiosk C |
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| 515 | The effect of ferric dosing of lakes on benthic invertebrates : first year report |
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| 516 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk D |
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| 517 | Bathing water quality in England and Wales in 1993 : report of the National Rivers Authority |
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| 518 | The distribution of PCDDS and PCDFS in surface freshwater systems 2nd Interim Progress Report - February 1993 |
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| 519 | Routine laboratory water sample data for the Wensum Demonstration Test Catchment's monitoring kiosk M |
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| 520 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk M |
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| 521 | Monitoring of the River Burn upstream and downstream of Burnham Market sewage treatment works 1999 |
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| 522 | YSI, turbidity and discharge data for the Wensum Demonstration Test Catchment's monitoring kiosk M in 2013 |
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| 523 | An environmental assessment of mercury in mussels (Mytilus edulis L.) in the Mersey Estuary : final report |
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| 524 | Use Of Pattern Recognition To Identify The Source Of An Oil Spill On An Inland Water |
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| 525 | Aldrin and dieldrin concentrations in the Newlyn catchment during 1991 an interim report |
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