Duncan, Ursula K. <br/><br/>
Introduction to British lichens / 
by Ursula K. Duncan, assisted by P. W. James. 
 - Arbroath :  T. Buncle,  1970. 
 - lxxiv, 292 p., 129 plates. :  ill. ;  23 cm. 
<br/><br/>Bibliography : p. 231-274. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lichens--United Kingdom.