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World Health Organization ,  Inter-Regional Seminar on Smallpox Eradication (1969 : Lagos, Nigeria) ,  [Rapport sur la variole : pays, états du nord du Nigéria]

World Health Organization ,  Inter-Regional Seminar on Smallpox Eradication (1969 : Lagos, Nigeria) ,  [Rapport sur la variole]

World Health Organization ,  Inter-Regional Seminar on Smallpox Eradication (1969 : Lagos, Nigeria) ,  [Rapport sur la variole : pays, Haute Volta]

World Health Organization ,  Inter-Regional Seminar on Smallpox Eradication (1969 : Lagos, Nigeria) ,  [Rapport sur la variole]

World Health Organization ,  [Programme national d' éradication de la variole : rapport d' enquête]

World Health Organization ,  Inter-Regional Seminar on Smallpox Eradication (1969 : Lagos, Nigeria) ,  [Rapport sur la variole : pays, Sierra Leone]

World Health Organization ,  Inter-Regional Seminar on Smallpox Eradication (1969 : Lagos, Nigeria) ,  [Rapport sur la variole : pays, Ghana]

World Health Organization ,  [WHO vaccine-preventable diseases : monitoring system : 2004 global summary]

World Health Organization ,  World Health Organization. Global Commission for the Certification of Smallpox Eradication ,  [Smallpox eradication in the Republic of Djibouti : status report, 13 November 1978]

World Health Organization ,  [WHO vaccine-preventable diseases : monitoring system : 2009 global summary]