| Title | Authors | Year | 
|---|---|---|
| Physiological-effects of long-term exposure to low concentrations of SO2 and NH3 on poplar leaves | 
                               Hove, L.W.A…  | 
                                                                                        1991 | 
| Concurrent exposure to SO2 and/or NO2 alters groweth and Yield responses of wheat and barley to low concentrations of O3. | 
                               Adaros, G…  | 
                                                                                        1991 | 
| Acid deposition: its nature and impacts | 
                               Last, F.T…  | 
                                                                                        1991 | 
| Acidic deposition: its nature and impacts | 
                               Last, F.T…  | 
                                                                                        1991 | 
| Nitrate in soil water | 
                               Westling, O…  | 
                                                                                        1991 | 
| Changes in species composition of semi-natural vegetation associated with the increase in atmospheric inputs of nitrogen | 
                               Pitcairn, C…  | 
                                                                                        1991 | 
| Decline of ectomycorrhizal fungi in Europe. | 
                               Arnolds, E…  | 
                                                                                        1991 | 
| Acid Rain - Critical and Target Load Maps for the United Kingdom | 
                               Environment…  | 
                                                                                        1991 | 
| The mechanisms of arsenate tolerance in Deschampsia cespitosa (L.) Beauv. and Agrostis capillaris L. Adaptation of the arsenate uptake system | 
                               Meharg, A.…  | 
                                                                                        1991 | 
| The effects of acid deposition on nature conservation in Great Britain | 
                               Ormerod, S.…  | 
                                                                                        1991 |