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By "Thomson, R. B. (Robert Boyd), 1870-1947"
A guide to the poisonous plants and weed seeds of Canada and the northern United States / by R.B. Thomson and H.B. Sifton.
By: Thomson, R. B. - Sifton, H. B.
Publication info: Toronto :University of Toronto Press,1922.
Contributed by: Robarts - University of Toronto (archive.org)