| 5501 | Herbarium Image: Carex arenaria |
|---|
| 5502 | Herbarium Image: Elodea sp. |
|---|
| 5503 | Herbarium Image: Carex aquatilis |
|---|
| 5504 | Herbarium Image: Persicaria amphibia |
|---|
| 5505 | Herbarium Image: Persicaria amphibia |
|---|
| 5506 | Herbarium Image: Persicaria hydropiper |
|---|
| 5507 | Herbarium Image: Eleocharis palustris |
|---|
| 5508 | Herbarium Image: Persicaria amphibia |
|---|
| 5509 | Herbarium Image: Schoenoplectus lacustris |
|---|
| 5510 | Herbarium Image: Schoenoplectus tabernaemontani |
|---|
| 5511 | A report on the use of pesticides at two Hampshire watercress farms |
|---|
| 5512 | A field guide to the British seaweeds : as required for assistance in the classification of water bodies under the Water Framework Directive |
|---|
| 5513 | Radiation Experiments on Aquatic Organisms |
|---|
| 5514 | Impact Of Conifer Harvesting And Replanting On Upland Water Quality |
|---|
| 5515 | Porth, Gluvian and Menalhyl catchment river water quality classification 1990 |
|---|
| 5516 | River Cober catchment river water quality classification 1991 |
|---|
| 5517 | River Fal catchment river water quality classification 1990 |
|---|
| 5518 | Fact sheet for the RBCA tool kit for chemical releases |
|---|
| 5519 | River Fal catchment river water quality classification 1991 |
|---|
| 5520 | River Par and Crinnis catchment river water quality classification 1990 |
|---|
| 5521 | River Par and Crinnis catchment river water quality classification 1991 |
|---|
| 5522 | St Austell River and south Cornwall coastal streams catchment river water quality classification 1990 |
|---|
| 5523 | A draft code of practice for analytical quality control in National Rivers Authority laboratories |
|---|
| 5524 | Control samples for ph determination in low ionic strength waters |
|---|
| 5525 | Proposals to introduce operator monitoring assessment for emissions to air from processes regulated under integrated pollution control : consultation paper |
|---|
