Assessing the impact of the Canada-U.S. trade agreement on food processing in Canada. An analytical framework and preliminary results for poultry, dairy and tomatoes / Erna van Duren, Larry Martin. -- Guelph : University of Guelph, 1990. -- 27 s. -- (Working papers series 30/1990). -- obr., tab. mäso hydiny * mlieko * paradajky * obchod zahraničný