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Natural and political observations mentioned in a following index, and made upon the Bills of mortality / By Capt. John Graunt, fellow of the Royal society. With reference to the government, religion, trade, growth, air, diseases, and the several changes of the said city [London] [Sometimes ascribed to Sir W. Petty]. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.