Purvis, William <br/><br/>
Lichens / 
William Purvis. 
 - London :  Natural History Museum,  c2000. 
 - 112p :  col. ill. ;  24 cm. 
 - Life series .
<br/><br/><label>ISBN: </label>0565091530 9780565091538 
<br/><br/><label>Nat. Bib. No.: </label>GBA066409  bnb 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lichens.