Hawksworth, David L. <br/><br/>
The lichen-forming fungi / 
David L. Hawksworth, David J. Hill 
 - London :  Blackie,  1984 
 - 158 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>021691633X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lichens<br/>Plants, Effect of air pollution on