| Title | Authors | Year | 
|---|---|---|
| Uptake, accumulation and translocation of arsenate in arsenate-tolerant and non-tolerant Holcus lanatus L. | Meharg, A. A… | 1991 | 
| Influence of HN3 and (HN4)2 SO4 on heathland vegetation | Van der… | 1991 | 
| Air pollution and agriculture | Ashmore, M.… | 1991 | 
| Nitrogen Uptake and Allocation by Calluna-Vulgaris (L) Hull and Deschampsia-Flexuosa (L) Trin Exposed to 15NH3 | Dueck, T.A… | 1991 | 
| The yield of winter cereals exposed to sulphur dioxide under field conditions. | McLeod, A.R… | 1991 | 
| Forestry and soil protection in the UK | Moffatt, A.… | 1991 | 
| Increases in soil acidity in north west Wales between 1957 and 1990 | … | 1991 | 
| Conservation of freshwater fish in the British Isles: the current status and biology of threatened species. Aquatic Conservation | Maitland, P… | 1991 | 
| Acid rain since 1985 - times are changing | Brydges, T.… | 1991 | 
| Effects of sulphur dioxide on the development of fungal diseases of winter barley in an open-air fumigation system. | Mansfield,… | 1991 |