| 3501 | River Avon catchment river water quality classification 1990 |
|---|
| 3502 | Classification of estuary quality |
|---|
| 3503 | Low-cost modifications of the Crump weir to improve fish passage |
|---|
| 3504 | Croal/Irwell local environment agency plan : statement of consultation |
|---|
| 3505 | Welsh Regional plan summary 1991/92 (bilingual) : Rhanbarth Cymru crynodeb cynllun 1991/92 |
|---|
| 3506 | The NEA International FEP Database and its Use in Support of Regulatory Review |
|---|
| 3507 | A review of the industrial uses of continuous monitoring systems : metals industry processes |
|---|
| 3508 | Diagnostic Drawing: Cyanobacteria - unicellular and colonial, |
|---|
| 3509 | Diagnostic Drawing: Charophyceae, |
|---|
| 3510 | Paraleptophlebia submarginata |
|---|
| 3511 | Enhancing the River Tamar |
|---|
| 3512 | Diagnostic Drawing: Conjugales, |
|---|
| 3513 | Policy and practice for the protection of groundwater - Thames region appendix |
|---|
| 3514 | River Flow Indexing using benthic macroinvertebrates |
|---|
| 3515 | Information [on the NRA Anglian Region] |
|---|
| 3516 | Policy and practice for the protection of floodplains |
|---|
| 3517 | Front Cover of Turbulence in Lakes and Rivers |
|---|
| 3518 | Maidenhead, Windsor and Eton flood alleviation scheme water quality study : final report appendices |
|---|
| 3519 | 'Sea Vigil' water quality monitoring : the Wash 1992-1993 |
|---|
| 3520 | Ecdyonurus insignis |
|---|
| 3521 | Diagnostic Drawing: Chrysophyceae, |
|---|
| 3522 | Diagnostic Drawing: Conjugales desmids, |
|---|
| 3523 | Herbarium Image: Arenaria serpyllifolia |
|---|
| 3524 | Diagnostic Drawing: Cryptophyceae, |
|---|
| 3525 | Diagnostic Drawing: Cyanobacteria, |
|---|
