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2. Survey of Professional Manpower in Pulmonary Diseases;Am Rev Respir Dis,1973
3. National Heart, Blood Vessel, Lung and Blood Program, publication 73-519;Report of the Lung Disease Panel,1973
4. Respiratory Diseases Task Force Report on Problems, Research Approaches, Needs, publication 73-432,1972
5. Data from the National Health Survey 1973, National Center for Health Statistics;Vital and Health Statistics,1974