1 | River water quality in the Midlands 1997 |
2 | River water quality in the Midlands 1998 |
3 | River water quality in the Midlands 1994/95 : water quality summary data |
4 | Eel and elver studies in the Severn : interim report (256/6/ST) |
5 | Acidification of freshwaters: the threat and its mitigation |