A revisional study of the genus Scolytus geoffroy (Eccoptogaster herbst) in North America
By: by M.W. Blackman.
Contributors: United States. Dept. of Agriculture.
Series: Technical bulletin / United States Department of Agriculture -- no. 431; Technical bulletin (United States. Dept. of Agriculture) -- no. 431.
Publisher: U.S. Dept. of Agriculture
Published: 1934
Place of publication: Washington
Language: eng
Number of pages: 30
Subjects: Fir -- Diseases and pests -- North America.; Bark beetles -- North America -- Identification.
Genres: Identification.
Notes: Caption title.

Literature cited: p. 28-30.