Sierra Leone / medical officer at present responsible for smallpox eradication, E.S. Johnson
Johnson, E. S & World Health Organization. (1975). Sierra Leone / medical officer at present responsible for smallpox eradication, E.S. Johnson. Geneva, Switzerland : World Health Organization. http://www.who.int/iris/handle/10665/68153
Gov't Doc #SE/WP/75.6
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Cummings, E. C; World Health Organization; WHO Inter-Regional Seminar on Surveillance and Assessment in Smallpox Eradication (1970 : New Delhi, India) (SE/WP/70.7, 1970)