Salmon A. Phelps to Abraham Lincoln, [November 1857] (Campaign Digital Edition)
Lincoln & Herndon to Samuel C. Davis & Company, 23 February 1858 (Campaign Digital Edition)
Anthony Thornton to Abraham Lincoln, 31 May 1858 (Campaign Digital Edition)
Abraham Lincoln to Henry E. Dummer, 20 July 1858 (Campaign Digital Edition)
Henry E. Dummer to Abraham Lincoln, [late-July to early-August 1858] (Campaign Digital Edition)