| 
by Mason E. HalePaperback details (USA). details (UK). 
 details (Canada). ISBN: 978-0-697-04822-6 ISBN-10: 0-697-04822-5 WCB/McGraw-Hill · 1969  | 
| See also: | ||
| 1979 | Spiral-bound | How to Know the Lichens (Pictured Key Nature Series) | 
| 1979 | Hardcover | How to Know the Lichens (The Pictured Key Nature Series) |