Campagne contre la variole
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Laboratory and vaccination studies with dried smallpox vaccines : a report to the World Health Organization / W. Chas Cockburn ... [et al.] ; with a statistical note on the trial of smallpox vaccine / by C.C. Spicer Cross, R. M; Downie, A. W; Dumbell, Keith R; Kaplan, Colin; McClean, D; Payne, A. M.-M; Spicer, C. C; World Health Organization (WHO/Smallpox/5, 1956)