1 | River water quality in the Midlands 1997 |
2 | River water quality in the Midlands 1998 |
3 | Conservation in the Severn-Trent Region (NRA Severn-Trent 57)
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4 | River water quality in the Midlands 1994/95 : water quality summary data |
5 | The Worcestershire Stour catchment : recommendations for statutory water quality objectives |