26 | Graphical representation of certain metals and organics concentrations versus flow rates for some of the rivers in Districts 3 and 6 |
27 | Analysis of natural and polluted river communities in Great Britain- Progress report for the period January-December 1987 |
28 | Maidenhead, Windsor and Eton flood alleviation scheme - National Association of Flood Defence chairmen visit to the project site on 1 May 1991 |
29 | Graphical representation of certain metals and organics concentrations in relation to flow rates and sampling times for some of the rivers in District 6 |