A guardroom: an officer holds up a map to show to a man smoking a long pipe, another man sits at a writing desk, others talk in the doorway. Engraving by J. Houbraken after C. Troost.

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A guardroom: an officer holds up a map to show to a man smoking a long pipe, another man sits at a writing desk, others talk in the doorway. Engraving by J. Houbraken after C. Troost. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.