Spruce budworm defoliation in northeastern Minnesota decreases in 1963
By: [Stephen O. Ryan, Harold O. Batzer]
Series: Research note LS / Lake States Forest Experiment Station -- 39; Research note LS -- 39.
Publisher: Lake States Forest Experiment Station, U.S. Dept. of Agriculture
Published: 1964
Place of publication: St. Paul, Minn
Language: eng
Subjects: Spruce budworm
Notes: Caption title.

"April 1964"--P. [1].

Includes bibliographical references.