1 | The quality of the Humber Estuary 1980-1990 : report of the National Rivers Authority |
2 | Humber estuary : state of the environment 1998 |
3 | Valuing the Humber's environmental assets : proceedings of a seminar 15 November 2000 |
4 | 'Sea Vigil' water quality monitoring : the Humber estuary 1992-1993 |
5 | 'Sea Vigil' water quality monitoring : the Humber estuary 1994 |