Biodiversity Heritage Library
By "Peterson, D. G. "
Control of black flies in Canada /
By: Twinn, C. R. - Peterson, D. G. - Canada. Dept. of Agriculture.
Publication info: Ottawa :Science Service, Entomology Division, Canada Dept. of Agriculture,1955 (1958 printing).
Contributed by: Agriculture and Agri-Food Canada (archive.org)