The clover and alfalfa seed chalcis-fly
By: Theodore D. Urbahns
Series: Bulletin / United States Department of Agriculture -- no. 812; Bulletin of the U.S. Department of Agriculture -- no. 812.
Publisher: U.S. Dept. of Agriculture
Published: 1920
Place of publication: Washington, D.C
Language: eng
Number of pages: 20
Subjects: Chalcid wasps; Alfalfa; Diseases and pests; Clover
Notes: Caption title.

"May 31, 1920."

"Professional paper."

Bibliography: p. 20.