| 501 | Thames Environment 21. The Environment Agency strategy for land-use planning in Thames Region |
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| 502 | Bathing water quality in England and Wales in 1994 : report of the National Rivers Authority |
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| 503 | Interim guidelines on the ranges of enteric organism decay rates (T90s) under different marine conditions |
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| 504 | Trevone Bay beach EC bathing water guideline non-compliance : investigation into the Trevone Stream : final report |
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| 505 | Water pollution incidents in England and Wales 1994 : report of the National Rivers Authority |
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| 506 | Saving water : the NRA's approach to water conservation and demand management : a consultation report |
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| 507 | YSI, turbidity and stage data for the Wensum Demonstration Test Catchment's monitoring kiosk D in 2011 |
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| 508 | Routine laboratory water sample data for the Wensum Demonstration Test Catchment's monitoring kiosk A |
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| 509 | Old Bedford incorporating the Middle Level and Ouse Washes : consultation report - May 1997 |
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| 510 | Impact assessment of Helston Sewage Treatment Works on water quality of the River Cober Loe Pool |
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| 511 | Improved monitoring for surface water quality : the development of a manual of best practice |
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| 512 | Economic evaluation of inland fisheries: The economic impact of freshwater angling in England and Wales |
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| 513 | An audit of performance in the processing of macro-invertebrate samples in 1992 |
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| 514 | Routine laboratory water sample data for the Wensum Demonstration Test Catchment's monitoring kiosk D |
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| 515 | Annual review of the Colne, Upper Lee, North London and Roding, Beam and Ingerbourne catchments |
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| 516 | Hope Cove : non-compliance in 1998 with the European Community bathing water directive (76/160/EEC) |
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| 517 | The hydrological effects of demand management : project definition stage report : 28th May 1996 |
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| 518 | YSI, turbidity and stage data for the Wensum Demonstration Test Catchment's monitoring kiosk B in 2011 |
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| 519 | Manual for the use of herbicides in or near water : January 1993 : final draft report |
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| 520 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk A |
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| 521 | The development of a portable battery-powered telemetry system for use in water quality investigations |
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| 522 | River Meavy salmon and sea trout populations : assessment of the impact of flows |
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| 523 | Routine laboratory water sample data for the Wensum Demonstration Test Catchment's monitoring kiosk C |
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| 524 | The effect of ferric dosing of lakes on benthic invertebrates : first year report |
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| 525 | ISCO automatic water sample data for the Wensum Demonstration Test Catchment's Kiosk D |
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