title: Fifty years ago: 'Parameters of occupational health in America'.
mesh_terms: D019981:Health Care Sector / Q000266:history / Q000458:organization & administration*; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D016272:Occupational Health / Q000266:history / Q000706:statistics & numerical data; D014481:United States / Q000453:epidemiology