1 | The river Aire conservation within the catchment : a summary of survey methods and information held on the wildlife of the river Aire catchment |
2 | The quality of rivers and estuaries in Northumbria region 1990 |
3 | 'Sea Vigil' water quality monitoring : the Humber estuary 1992-1993 |
4 | 'Sea Vigil' water quality monitoring : the Humber estuary 1994 |
5 | The Natural (Baseline) Quality of Groundwaters in England and Wales - Magnesium Limestone of Yorkshire and Northumbria |