1 | The quality of the Humber Estuary 1980-1990 : report of the National Rivers Authority |
2 | Humber estuary : state of the environment 1998 |
3 | Report on the control of discharges of titanium dioxide waste to the Humber Estuary : appendices |
4 | Report on the control of discharges of titanium dioxide waste to the Humber Estuary : main report |