| 6801 | Herbarium Image: Carex arenaria |
|---|
| 6802 | Herbarium Image: Elodea sp. |
|---|
| 6803 | Herbarium Image: Carex aquatilis |
|---|
| 6804 | Herbarium Image: Persicaria amphibia |
|---|
| 6805 | Herbarium Image: Persicaria amphibia |
|---|
| 6806 | Herbarium Image: Persicaria hydropiper |
|---|
| 6807 | Herbarium Image: Eleocharis palustris |
|---|
| 6808 | Herbarium Image: Persicaria amphibia |
|---|
| 6809 | Herbarium Image: Schoenoplectus lacustris |
|---|
| 6810 | Herbarium Image: Schoenoplectus tabernaemontani |
|---|
| 6811 | Best Management Practices to Reduce Diffuse Pollution from Agriculture |
|---|
| 6812 | A report on the use of pesticides at two Hampshire watercress farms |
|---|
| 6813 | Impact Of Conifer Harvesting And Replanting On Upland Water Quality |
|---|
| 6814 | Porth, Gluvian and Menalhyl catchment river water quality classification 1990 |
|---|
| 6815 | River Cober catchment river water quality classification 1991 |
|---|
| 6816 | River Fal catchment river water quality classification 1990 |
|---|
| 6817 | Fact sheet for the RBCA tool kit for chemical releases |
|---|
| 6818 | River Fal catchment river water quality classification 1991 |
|---|
| 6819 | River Par and Crinnis catchment river water quality classification 1990 |
|---|
| 6820 | River Par and Crinnis catchment river water quality classification 1991 |
|---|
| 6821 | St Austell River and south Cornwall coastal streams catchment river water quality classification 1990 |
|---|
| 6822 | A draft code of practice for analytical quality control in National Rivers Authority laboratories |
|---|
| 6823 | Control samples for ph determination in low ionic strength waters |
|---|
| 6824 | Proposals to introduce operator monitoring assessment for emissions to air from processes regulated under integrated pollution control : consultation paper |
|---|
| 6825 | Cryptosporidium in drinking water : survey of occurrence. June 1991 |
|---|
