1 | Stream survey and assessment in the Ashford and Folkestone areas |
2 | The 1990 river and estuary classification survey of England and Wales |
3 | Changes in the phosphorus content of the sediment of Esthwaite Water and water quality in response to a decreasing input of sewage-borne phosphorus |
4 | National marine baseline survey 1995 : littoral cell 2 : Flamborough Head to the Wash |
5 | National marine baseline survey 1995 : littoral cell 4 : the Thames to Selsey Bill |
6 | Chemical river quality 1993-1995 according to the general quality assessment (GQA) scheme [map] : scale 1 : 750 000 |