1 | River water quality in the Midlands 1997 |
2 | River water quality in the Midlands 1998 |
3 | Getting afloat in the Midlands : a guide to using waterways in the region |
4 | The quality of rivers, canals and estuaries in England and Wales : report of the 1990 survey |
5 | River quality in England and Wales : a report of the 1990 survey |
6 | The quality of rivers and canals in England and Wales (1990 to 1992) : as assessed by a new general quality assessment scheme : report of the National Rivers Authority |
7 | Biological river quality 1995 according to the general quality (GQA) scheme [map] : scale 1 : 750 000 |
8 | Economic evaluation of inland fisheries: The economic impact of freshwater angling in England and Wales |
9 | Chemical river quality 1993-1995 according to the general quality assessment (GQA) scheme [map] : scale 1 : 750 000 |
10 | Chironomids as indicators of biological quality : present use and future potential : a report of a workshop held at the Environment Agency, Thames Region |