What's wrong with my trees?
Subtitle: Douglas-fir damaged by engraver beetles
Series: Miscellaneous paper / California Forest and Range Experiment Station -- no. 30; Miscellaneous paper (California Forest and Range Experiment Station) -- no. 30.
Publisher: California Forest and Range Experiment Station
Published: 1959
Place of publication: Berkeley, Calif.]
Language: eng
Subjects: Bark beetles; Douglas fir; Diseases and pests
Notes: Caption title.

"February 1959."