Biodiversity Heritage Library
By "Tothill, John D. (John Douglas), 1888-"
The natural control of the fall webworm (Hyphantria cunea Drury) in Canada : together with an account of its several parasites /
By: Tothill, John D. (John Douglas), - Canada. Dept. of Agriculture.
Publication info: Ottawa :F.A. Acland, King's Printer,1922.
Contributed by: Agriculture and Agri-Food Canada (archive.org)