Benjamin Silliman by Rudolf Hoffmann after Gibbs, 1857, lithograph with tintstone on paper, from the National Portrait Gallery - NPG-NPG-NPG 86 46Silliman-000001

Benjamin silliman by rudolf hoffmann after gibbs, 1857, lithograph with tintstone on paper, from the national portrait gallery which has explicitly released this digital image under the cc0 license. (https://npg. Si. Edu/object/npg_npg. 86. 46). Date: 1857.