Hover or syrphid flies
By: by Arthur H. Retan and James Curtis.
Series: Insect answers; Extension mimeo -- 3704.; Extension mimeo (Washington State University. Cooperative Extension Service) -- 3704.
Publisher: Cooperative Extension Service, College of Agriculture, Washington State University
Published: 1972
Place of publication: Pullman
Language: eng
Notes: Caption title.

"October 1972."

"E.M. 3704."