Black grain-stem sawfly of Europe in the United States
By: by A.B. Gahan
Series: Bulletin / United States Department of Agriculture -- no. 834; Bulletin of the U.S. Department of Agriculture -- no. 834.
Publisher: U.S. Dept. of Agriculture
Published: 1920
Place of publication: Washington, D.C
Language: eng
Number of pages: 18
Subjects: Black grain-stem sawfly; Agricultural pests
Other titles: Black grain stem sawfly of Europe in the United States.
Notes: Caption title.

"May 19, 1920."

"Professional paper."

Bibliography: p. 14-18.