License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Currier & Ives. The Splendid Naval Triumph on the Mississippi, April 24th, 1862: Destruction of the Rebel Gunboats, Rams, and Iron Clad Batteries by the Union Fleet under Flag Officer Farragut, 1862. The Metropolitan Museum of Art.