1 | Report on the control of discharges of titanium dioxide waste to the Humber Estuary : appendices |
2 | Analysis of benthic macro-invertebrate samples collected by the NRA during 1989 and 1990 from various habitats in the River Delph |
3 | The River Colne Estuary subtidal biological survey 1992 |
4 | Stream survey and assessment in the Ashford and Folkestone areas |
5 | An ecological study of the effects of ferric dosing on the plankton and benthic invertebrates of Grafham Water between May 1990 and November 1991 |
6 | Thames estuary benthic programme : a site by site report on the results of macroinvertebrate surveys undertaken during 1990-91 |