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.

Licence: Public Domain Mark

Credit: 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. Source: Wellcome Collection.