51 | Thames estuary benthic programme : a site by site report on the results of macroinvertebrate surveys undertaken during 1990-91 |
52 | Graphical representation of certain metals and organics concentrations versus flow rates for some of the rivers in Districts 3 and 6 |
53 | Creating a greenprint for London : An invitation to work with the Environment Agency towards a first-class environment for a world-class city |
54 | Environmental assessment guidelines : a procedure for ensuring environmental factors are taken into account in the design and implementation of land drainage improvement works |
55 | Graphical representation of certain metals and organics concentrations in relation to flow rates and sampling times for some of the rivers in District 6 |