Cone and seed insects of North American conifers /
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.
Conifers--Diseases and pests--Canada.
Conifers--Seeds--Diseases and pests--Canada.
634.9/75
Conifers--Diseases and pests--Canada.
Conifers--Seeds--Diseases and pests--Canada.
634.9/75