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Laboratory service, Provincial Board of Health of Ontario: main laboratories, 5 Queen's Park, Toronto, branch laboratories, Queen's University, Kingston, Ontario, branch laboratories, Ottaway Ave. and Waterloo St., London, Ontario
Laboratory service, Provincial Board of Health of Ontario: main laboratories, 5 Queen's Park, Toronto, branch laboratories, Queen's University, Kingston, Ontario, branch laboratories, Ottaway Ave. and Waterloo St., London, Ontario