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Boake A. Sells, the former president of Dayton Hudson Corp., has been named chairman of Revco D. S. Inc., Twinsburg, Ohio. Sells replaces Sidney Dworkin, a co-founder of the discount drugstore chain, who resigned. His son, Revco Executive Vice President Marc Dworkin, also resigned, and the two sold their interest in the company for an undisclosed amount of cash and some Revco assets, the company said. Revco, with 2,000 outlets, is the nation’s largest drugstore chain.