Studies on the spruce budworm [Cacoecia fumiferana Clem.]
Part I.
A general account of the outbreaks, injury and associated insects,
by J. M. Swaine and F. C. Craighead.
Part II.
General bionomics and possibilities of prevention and control, by F. C. Craighead. With a chapter on abnormalities of cell structure, by I. W. Bailey ...

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