Field and laboratory techniques for evaluating hemlock sawfly infestations
By: by John S. Hard and Torolf R. Torgersen.
Contributors: Torgersen, Torolf R.
Series: USDA Forest Service research note PNW -- 252.
Publisher: U.S. Forest Service
Published: 1975
Place of publication: Portland, Or
Language: eng
Number of pages: 23
Subjects: Hemlock sawfly.
Notes: Issued Aug. 1975.

Bibliography: p. 22-23.