Abraham Lincoln to John M. Clayton, 25 November 1849 (Campaign Digital Edition)
Abraham Lincoln to Thomas Corwin, 1 September [1850] (Campaign Digital Edition)
Richard B. Servant to Abraham Lincoln, 14 June 1858 (Campaign Digital Edition)
Ebenezer Peck to Abraham Lincoln, 18 August 1858 (Campaign Digital Edition)
Sydney Spring to Abraham Lincoln, [May 29 - June 15, 1858] (Campaign Digital Edition)