David Octavius Hill, 1866, The Disruption of the Church of Scotland 1843 (Drawing for the engraved key to the painting in the collection of the Free Church), Ink on paper, National Galleries of Scotland, LL/85864
Erskine Nicol (Scottish, 1825-1904), 1892, George Skene Keith, 1819 - 1910. Physician, Watercolour and gouache on paper, National Galleries of Scotland, LL/86551