| Title | Authors | Year |
|---|---|---|
| Conservation of freshwater fish in the British Isles: the current status and biology of threatened species. Aquatic Conservation |
Maitland, P… |
1991 |
| Nitrate in soil water |
Westling, O… |
1991 |
| A Field-Study of Fertilization and Embryonic Development in the Common Frog (Rana-Temporaria) with Particular Reference to Acidity and Temperature |
Beattie, R.… |
1991 |
| Effects of sulphur dioxide on the development of fungal diseases of winter barley in an open-air fumigation system. |
Mansfield,… |
1991 |
| Critical Load Maps for the United Kingdom I: Soil |
UKCLAG, |
1991 |
| Acid rain since 1985 - times are changing |
Brydges, T.… |
1991 |
| Environmental Health Criteria 125 Platinum |
WHO, |
1991 |
| Atmospheric Transport of Iron and Its Deposition in the Ocean |
Duce, R. A… |
1991 |
| Zeigerwerte von Pflanzen in Mitteleuropa |
Ellenberg,… |
1991 |
| Nitrogen Uptake and Allocation by Calluna-Vulgaris (L) Hull and Deschampsia-Flexuosa (L) Trin Exposed to 15NH3 |
Dueck, T.A… |
1991 |