501 | Humber estuary catchment management plan : report summary : July 1994 |
502 | River Otter : environmental data review. Volume 4 : appendices : River Otter environmental study 1993/94 |
503 | 1990 classification of estuary quality |
504 | East Looe river : river ecosystem (RE) non-compliance investigation : final draft report |
505 | River Dart catchment river water quality classification 1990 |
506 | River quality : July 1990 - June 1991 |
507 | Yare catchment management plan : consultation report summary |
508 | River Gannel catchment river water quality classification 1991 |
509 | Determination of Metal Background Reference Concentrations: Feasibility Study |
510 | River Irwell catchment management plan : water quality supplement |
511 | Bathing water quality in England and Wales in 1993 : report of the National Rivers Authority |
512 | The Natural (Baseline) Quality Of Groundwaters In England And Wales - The Chalk Of Lincolnshire; |
513 | The River Ash : enhancement project |
514 | UK Sewage Sludge Survey |
515 | The management of the water resources of the Little Ouse groundwater unit |
516 | River Yealm catchment river water quality classification 1991 |
517 | Regional water quality monitoring and surveillance programme for 1992 : quality assessment of river waters |
518 | River water quality in the Midlands 1994/95 : water quality summary data |
519 | St Agnes spore and dye survey 10/8/95 (draft) |
520 | Applications Of Artificial Intelligence For The Biological Surveillance Of River Quality |
521 | A review of polyelectrolytes to identify priorities for EQS Development |
522 | River Exe catchment management plan : consultation report |
523 | River Fish Habitat Inventory Phase 3 phase III: multi-species models |
524 | APPRAISE II: Review of Aquatic Dispersion Models |
525 | Regional water quality monitoring and surveillance programme for 1992 : biological impact assessment of discharges on receiving waters |