| Title | Authors | Year |
|---|---|---|
| Zeigerwerte von Pflanzen in Mitteleuropa |
Ellenberg,… |
1991 |
| The yield of winter cereals exposed to sulphur dioxide under field conditions. |
McLeod, A.R… |
1991 |
| Acid deposition: its nature and impacts |
Last, F.T… |
1991 |
| Acidic deposition: its nature and impacts |
Last, F.T… |
1991 |
| Physiological effects of long term exposure to low concentrations of SO2 and NH3 on poplar leaves. |
Hove, L.W.A… |
1991 |
| Single and Interactive Effects of Low Levels of O3, SO2 and NO2 on the Growth and Yield of Spring Rape. |
Adaros, G… |
1991 |
| Nitrate in soil water |
Westling, O… |
1991 |
| Effects of sulphur dioxide on the development of fungal diseases of winter barley in an open-air fumigation system. |
Mansfield,… |
1991 |
| Acid Rain - Critical and Target Load Maps for the United Kingdom |
Environment… |
1991 |
| Environmental Health Criteria 125 Platinum |
WHO, |
1991 |