Columbia subject headings:
Bark beetles--North America.
Beetles--Effect of forest management on--North America.
Forest insects--Control--North America.
Trees--Diseases and pests--North America.
Harvard subject headings:
Bark beetles--North America.
Beetles--Effect of forest management on--North America.
Forest insects--Control--North America.
Trees--Diseases and pests--North America.
Princeton subject headings: