John Clark M.D. by Thomas Edwards after an unidentified artist, 1828, lithograph on paper, from the National Portrait Gallery - NPG-S-NPG 78 55, Thomas Edwards

John clark m. D. By thomas edwards after an unidentified artist, 1828, lithograph on paper, from the national portrait gallery which has explicitly released this digital image under the cc0 license. (https://npg. Si. Edu/object/npg_s_npg. 78. 55). Date: 1828, after a 1661 painting.