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By "Verma, P.R. "
Monograph on downy mildew of crucifers.
By: Canada. Agriculture and Agri-Food Canada. Research Branch. - Nashaat, N.I. - Saharan, G.S. - Verma, P.R.
Publication info: Ottawa :Minister of Supply and Services Canada,1997.
Holding Institution: Agriculture and Agri-Food Canada (archive.org)