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Fenner, Frank ,  [Can smallpox return? / by Frank Fenner]

Fenner, Frank ,  [Can smallpox return? / Frank Fenner]

Fenner, Frank ,  [Can smallpox return? / by Frank Fenner]

Fenner, Frank ,  Breman, Joel G ,  World Health Organization ,  [Report on a visit to the People's Republic of China to consider matters relating to the certification of smallpox eradication, 14-30 July 1979 / F. Fenner and J.G. Breman]

Fenner, Frank ,  [Can smallpox return? / Frank Fenner]

Fenner, Frank ,  Breman, Joel G ,  World Health Organization ,  [Report on a visit to the People's Republic of China to consider matters relating to the certification of smallpox eradication, 14-30 July 1979 / F. Fenner and J.G. Breman]