| Title | Authors | Year | 
|---|---|---|
| Conservation of freshwater fish in the British Isles: the current status and biology of threatened species. Aquatic Conservation | 
                               Maitland, P…  | 
                                                                                        1991 | 
| Physiological effects of long term exposure to low concentrations of SO2 and NH3 on poplar leaves. | 
                               Hove, L.W.A…  | 
                                                                                        1991 | 
| Effects of sulphur dioxide on the development of fungal diseases of winter barley in an open-air fumigation system. | 
                               Mansfield,…  | 
                                                                                        1991 | 
| Environmental Health Criteria 125 Platinum | 
                               WHO,  | 
                                                                                        1991 | 
| Atmospheric Transport of Iron and Its Deposition in the Ocean | 
                               Duce, R. A…  | 
                                                                                        1991 | 
| Effects of ionising radiation on aquatic organisms | 
                               National…  | 
                                                                                        1991 | 
| Air pollution and agriculture | 
                               Ashmore, M.…  | 
                                                                                        1991 | 
| Physiological-effects of long-term exposure to low concentrations of SO2 and NH3 on poplar leaves | 
                               Hove, L.W.A…  | 
                                                                                        1991 | 
| The yield of winter cereals exposed to sulphur dioxide under field conditions. | 
                               McLeod, A.R…  | 
                                                                                        1991 | 
| The Distribution and Breeding Site Characteristics of Newts in Cumbria, England. | 
                               Denton, J.S…  | 
                                                                                        1991 |