Horn flies :
enemies of cattle.

APA Citation

United States. Extension Service. (1950). Horn flies: enemies of cattle. Washington, D.C.: United States Dept. of Agriculture Extension Service and Bureau of Entomology and Plant Quarantine.

MLA Citation

United States. Extension Service. Horn Flies: Enemies of Cattle. Washington, D.C.: United States Dept. of Agriculture Extension Service and Bureau of Entomology and Plant Quarantine, 1950.

Warning: These citations may not always be complete (especially for serials).