| Title | Authors | Year | 
|---|---|---|
| Acid deposition: its nature and impacts | 
                               Last, F.T…  | 
                                                                                        1991 | 
| The yield of winter cereals exposed to sulphur dioxide under field conditions. | 
                               McLeod, A.R…  | 
                                                                                        1991 | 
| Physiological effects of long term exposure to low concentrations of SO2 and NH3 on poplar leaves. | 
                               Hove, L.W.A…  | 
                                                                                        1991 | 
| Acidic deposition: its nature and impacts | 
                               Last, F.T…  | 
                                                                                        1991 | 
| Single and Interactive Effects of Low Levels of O3, SO2 and NO2 on the Growth and Yield of Spring Rape. | 
                               Adaros, G…  | 
                                                                                        1991 | 
| Decline of ectomycorrhizal fungi in Europe. | 
                               Arnolds, E…  | 
                                                                                        1991 | 
| Nitrate in soil water | 
                               Westling, O…  | 
                                                                                        1991 | 
| Acid Rain - Critical and Target Load Maps for the United Kingdom | 
                               Environment…  | 
                                                                                        1991 | 
| Seasonal variations in acidic pollutant inputs and their effects on the chemistry of stemflow, bark and epiphyte tissues in three oak woodlands in N.W. Britain | 
                               Farmer, A.M…  | 
                                                                                        1991 | 
| Physiological-effects of long-term exposure to low concentrations of SO2 and NH3 on poplar leaves | 
                               Hove, L.W.A…  | 
                                                                                        1991 |