Hawksworth, DL/ Rose, F 1970: Qualitative scale for estimating sulphur dioxide air pollution in England and Wales using epiphytic lichens. - Nature227: 145-148. [RLL List # 76 / Rec.# 7918] Keywords: WYRE FOREST/ BRITISH ISLES/ AIR POLLUTION/ SULPHUR DIOXIDE/ SO2/ TECHNIQUES
Abstract: 3 fig.