BOOKQUE

Report of a Study of Dissemination of Ontario Agricultural Research Findings
Donald J. Blackburn , Douglas H. Pletsch
· 1978
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Farm Information Sources Important to Ontario Farmers, Jan. 1983
Ontario Agricultural College. School of Agricultural Economics and Extension Education , Douglas H. Pletsch , Lauranne Sanderson , W. Stanley Young , Donald J. Blackburn
· 1983
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Correspondence with University of Ghana, 1972-1974
University of Guelph. President. (1967-1975 : Winegard), Douglas H. Pletsch , University of Ghana. Dept. of Agricultural Economy & Farm Management , University of Guelph. Ghana-Guelph Project
· 1972