| Title | Authors | Year | 
|---|---|---|
| Acid Rain - Critical and Target Load Maps for the United Kingdom | 
                               Environment…  | 
                                                                                        1991 | 
| Uptake, accumulation and translocation of arsenate in arsenate-tolerant and non-tolerant Holcus lanatus L. | Meharg, A. A… | 1991 | 
| Environmental Health Criteria 125 Platinum | 
                               WHO,  | 
                                                                                        1991 | 
| Effects of ionising radiation on aquatic organisms | 
                               National…  | 
                                                                                        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 | 
| Effects of nitrogen loading on wetland ecosystems, with particular reference to atmospheric deposition | 
                               Morris, J.T…  | 
                                                                                        1991 | 
| Zeigerwerte von Pflanzen in Mitteleuropa | 
                               Ellenberg,…  | 
                                                                                        1991 | 
| Physiological-effects of long-term exposure to low concentrations of SO2 and NH3 on poplar leaves | 
                               Hove, L.W.A…  | 
                                                                                        1991 | 
| Air pollution and agriculture | 
                               Ashmore, M.…  | 
                                                                                        1991 |