3 pages, 4to, fine." /> PORTER, David D. (1813-1891), <I>Admiral, U. S. N</I>. Autograph letter signed ("David D. Porter") to John A. Dahlgren, U.S.S. Powhatan off Pensacola, 22 May 1861. <I>3 pages, 4to, fine</I>. | Christie's