Original publication: unknown
Immediate source: http://www.npg.org.uk/collections/search/portraitLarge/mw140606/Joseph-Johnstone?LinkID=mp53952&search=sas&sText=Joseph+Johnstone&OConly=true&role=sit&rNo=0
Owned by the National Portrait Gallery who have made it available for use under a Creative Commons licence BY-NC-ND
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