Horn flies
Subtitle: enemies of cattle
Series: Leaflet / U.S. Department of Agriculture -- no. 270; Leaflet (United States. Dept. of Agriculture) -- no. 270.
Publisher: United States Dept. of Agriculture Extension Service and Bureau of Entomology and Plant Quarantine
Published: 1950
Place of publication: Washington, D.C
Language: eng
Subjects: Horn fly
Notes: Cover title.

"April 1950."