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 : 
<br/><br/> Sponsored jointly by the Systematics Association and the British Lichen Society; held in April 1974. 
<br/><br/><label>ISBN: </label>0121367509 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lichens.
<br/><br/><label>Dewey Class. No.: </label>579.7  / Li