Hale, Mason E. <br/><br/>
How to know the lichens / 
Mason E. Hale. 
 - 2d ed. 
 - Dubuque, Iowa :  W. C. Brown Co.,  c1979. 
 - viii, 246 p., [1] leaf of plates :  ill. ;  24 cm. 
 - The Pictured key nature series .
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. 22-24. 
<br/><br/><label>ISBN: </label>0697047628.  0697047636 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lichens--Identification.--United States<br/>Lichens--Identification.--North America
<br/><br/><label>LC Class. No.: </label>QK587  / .H25 1979 
<br/><br/><label>Dewey Class. No.: </label>589/.1/097