Media type: E-Article Title: John Alfred Ryle Contributor: Crew, F. A. E. imprint: BMJ, 1950 Published in: Journal of Epidemiology & Community Health Language: English DOI: 10.1136/jech.4.3.172 ISSN: 0143-005X Keywords: Public Health, Environmental and Occupational Health ; Epidemiology Origination: Footnote: Access State: Open Access