Hawksworth, DL 1973: Mapping studies. - In: B. W. Ferry, M. S. Baddeley & D. L. Hawksworth (eds.): Air Pollution and Lichens. . University of Toronto Press, Toronto pp. 38-76. [RLL List # 86 / Rec.# 7964] Keywords: AIR POLLUTION/ MAPPING/ BRITISH ISLES
Abstract: 3 tab. 5 fig.