| Title | Authors | Year |
|---|---|---|
| Changes in species composition of semi-natural vegetation associated with the increase in atmospheric inputs of nitrogen |
Pitcairn, C… |
1991 |
| Acid rain since 1985 - times are changing |
Brydges, T.… |
1991 |
| Environmental Health Criteria 125 Platinum |
WHO, |
1991 |
| Effects of ionising radiation on aquatic organisms |
National… |
1991 |
| Influence of HN3 and (HN4)2 SO4 on heathland vegetation |
Van der… |
1991 |
| Forestry and soil protection in the UK |
Moffatt, A.… |
1991 |
| Physiological effects of long term exposure to low concentrations of SO2 and NH3 on poplar leaves. |
Hove, L.W.A… |
1991 |
| Conservation of freshwater fish in the British Isles: the current status and biology of threatened species. Aquatic Conservation |
Maitland, P… |
1991 |
| Mechansims of adaptions of plants to acid soils |
Marschner,… |
1991 |
| Increases in soil acidity in north west Wales between 1957 and 1990 |
… |
1991 |