Paraguay : report on a survey to determine the status of smallpox and levels of smallpox immunity
World Health Organization. Smallpox Eradication Unit. (1972). Paraguay : report on a survey to determine the status of smallpox and levels of smallpox immunity. Geneva, Switzerland : World Health Organization. http://www.who.int/iris/handle/10665/67499
Gov't Doc #WHO/SE/72.38
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