Title Authors Year
A Field-Study of Fertilization and Embryonic Development in the Common Frog (Rana-Temporaria) with Particular Reference to Acidity and Temperature

Beattie, R.…

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
Nitrogen Uptake and Allocation by Calluna-Vulgaris (L) Hull and Deschampsia-Flexuosa (L) Trin Exposed to 15NH3

Dueck, T.A…

1991
Concurrent exposure to SO2 and/or NO2 alters groweth and Yield responses of wheat and barley to low concentrations of O3.

Adaros, G…

1991
The yield of winter cereals exposed to sulphur dioxide under field conditions.

McLeod, A.R…

1991
Critical Load Maps for the United Kingdom I: Soil

UKCLAG,

 		1991
Effects of sulphur dioxide on the development of fungal diseases of winter barley in an open-air fumigation system.

Mansfield,…

1991
Changes in species composition of semi-natural vegetation associated with the increase in atmospheric inputs of nitrogen

Pitcairn, C…

1991
Environmental Health Criteria 125 Platinum

WHO,

 		1991