- 1950-2003 (Creation)
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This series documents Dr. Mastromatteo’s participation in organizations, associations and societies. These groups pertain mainly to medicine, occupational health and safety, and labour conditions. The largest amounts of material are from the Ontario Medical Association, the International Labor Office, the Industrial Accident Prevention Association, the Canadian Public Health Association, the Canadian Medical Association, and the Atomic Energy Control Board.
Records in this series include notes, drafts, papers, correspondence, minutes, reports and memoranda.