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Credit
The Royal Exchange, London: elevation of the entrance facade, top, and ground plan of the courtyard, below, with indications of types of trade in the courtyard, heraldic emblems of the City of London and the Mercers' Company below, with a scale of feet. Engraving by A. Walker, 1808, after I. Donowell. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.