Abraham Lincoln to William H. Herndon, 1 February 1848 (Congressional Digital Edition)
Abraham Lincoln to William H. Herndon, 15 February 1848 (Congressional Digital Edition)
Schuyler Colfax to Abraham Lincoln, 25 August 1858 (Campaign Digital Edition)
Fragment on the Dred Scott Case, [December 1856 - August 1858] (Campaign Digital Edition)