26 | Analysis of natural and polluted river communities in Great Britain- Progress report for the period January-December 1987 |
27 | Low flows and water resources : facts on the top 40 low flow rivers in England and Wales |
28 | East Devon public water supply strategy : the existence and potential use in yield analysis of historic flow records |
29 | Darent action plan : restoration of low flows to the river Darent : public statement to accompany application to vary groundwater abstraction licences at Sundridge, Lullingstone, Eynsford, Horton Kirby, Darenth and Bexley |