1 | A Status Report on the Direct Oxygenation of the Tywi Estuary - October 1989 |
2 | The River Tywi catchment management plan : action plan (bilingual) |
3 | Biological characteristics and exploitation of sea trout in the River Tywi during 1989 |
4 | Freshwater migration of sea trout (Salmo trutta L.) in the river Tywi during 1988, 1989 and 1990 |