Sixteenth Regional Committee for Europe: Rabat, 6-10 September 1966: variola minor: England and Wales in 1966
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Regional Committee for Europe, 16th session. (1966). Sixteenth Regional Committee for Europe: Rabat, 6-10 September 1966: variola minor: England and Wales in 1966. World Health Organization. Regional Office for Europe. https://iris.who.int/handle/10665/359479