Lichenology : progress and problems :
edited by D. H. Brown, D. L. Hawksworth and R. H. Bailey.
- London ; Published for the Systematics Association and the British Lichen Society by Academic Press, 1976.
- xii, 551 p., [33] leaves of plates :
Sponsored jointly by the Systematics Association and the British Lichen Society; held in April 1974.