Alexander von Humboldt by Emma Gaggiotti-Richards, 1855, oil on canvas, from the National Portrait Gallery - NPG-S NPG 2019 12, Emma Gaggiotti Richards

Alexander von humboldt by emma gaggiotti-richards, 1855, oil on canvas, from the national portrait gallery which has explicitly released this digital image under the cc0 license. (https://npg. Si. Edu/object/npg_s_npg. 2019. 12). Date: 1855.