Ontario weeds
Subtitle: descriptions, illustrations and keys to their identification
By: by J. F. Alex and C. M. Switzer
Series: Publication - Ontario Ministry of Agriculture and Food -- 505
Publisher: Ontario Agricultural College, University of Guelph
Published: 1970
Place of publication: Guelph
Language: eng
Number of pages: 200
Subjects: Weeds
Notes: "Agdex 640."

Earlier edition by F. H. Montgomery and C. M. Switzer, published in 1966.

Includes indexes.