2) Douglas-fir beetle

Series
Quick guide volume FM 2016-1
Pub. Date
2016.

3) Fir engraver beetle

Series
Quick guide volume FM 2016-3
Pub. Date
2016.

4) Cooley spruce galls: characteristics and control

Author
Cranshaw, Whitney
Series
Service in action volume no. 5.534
Pub. Date
1989.