Affidavit of Samuel Rogers, 2 June 1834 (Legislative Digital Edition)

Survey of Section 16 in Township 17 North, Range 6 West, 10 May 1836 (Legislative Digital Edition)

Statement of Payment from Sangamon County Commissioners' Court to Abraham Lincoln for Surveying School Section, 4 September 1836 (Legislative Digital Edition)

Abraham Lincoln to Richard S. Thomas, 30 March 1848 (Congressional Digital Edition)

Abraham Lincoln to Richard S. Thomas, 13 June 1848 (Congressional Digital Edition)

Richard M. Young to Abraham Lincoln, 14 June 1848 (Congressional Digital Edition)

Abraham Lincoln to Richard S. Thomas, 15 June 1848 (Congressional Digital Edition)

Petition of Richard S. Thomas and Others to U.S. Congress, [6 December 1847 - 3 March 1849] (Congressional Digital Edition)