Cone and seed insects of North American conifers / 
Alan F. Hedlin ... [et al.]. 
 - [Ottawa] :  Canadian Forestry Service,  1980. 
 - vi, 122 p. :  ill. (some col.), col. maps ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conifers--Diseases and pests--Canada.<br/>Conifers--Seeds--Diseases and pests--Canada.
<br/><br/><label>Dewey Class. No.: </label>634.9/75