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Historical sketch of the opinions entertained by medical men respecting the varieties and the secondary occurrence of small-pox ; with observations on the nature and extent of the security afforded by vaccination against attacks of that disease : in a letter to Sir James M'Grigor ... / By John Thomson. Public Domain Mark. Source: Wellcome Collection.
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This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.