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Simpson, D. I. H ,  World Health Organization. Smallpox Eradication Unit ,  [Surveillance des fièvres à virus Ebola et Marburg / par D.I.H. Simpson]

Simpson, D. I. H ,  World Health Organization. Smallpox Eradication Unit ,  [Surveillance of Ebola/Marburg fevers / by D.I.H. Simpson]

Simpson, D. I. H ,  World Health Organization. Smallpox Eradication Unit ,  [Surveillance des fièvres à virus Ebola et Marburg / par D.I.H. Simpson]

Simpson, D. I. H ,  World Health Organization. Smallpox Eradication Unit ,  [Surveillance of Ebola/Marburg fevers / by D.I.H. Simpson]

World Health Organization. Smallpox Eradication Unit ,  [Methodology for preparation of appropriate data for the 31 countries remaining to be certified free of smallpox]

Tulloch, Jim ,  Tarantola, Daniel J. M ,  World Health Organization. Smallpox Eradication Unit ,  [A study of smallpox transmission rate in Bangladesh / by J. Tulloch, D. Tarantola]

World Health Organization. Smallpox Eradication Unit ,  [Methodology for preparation of appropriate data for the 31 countries remaining to be certified free of smallpox]

Tulloch, Jim ,  Tarantola, Daniel J. M ,  World Health Organization. Smallpox Eradication Unit ,  [A study of smallpox transmission rate in Bangladesh / by J. Tulloch, D. Tarantola]