1Horatio G. Spafford to Thomas Jefferson, 23 January 1815 (Jefferson Papers)
2Horatio G. Spafford to Thomas Jefferson, 28 January 1815 (Jefferson Papers)
3Horatio G. Spafford to Thomas Jefferson, 15 February 1815 (Jefferson Papers)
4Horatio G. Spafford to Thomas Jefferson, 18 February 1815 (Jefferson Papers)
5Thomas Jefferson to Horatio G. Spafford, 21 February 1815 (Jefferson Papers)
6Horatio G. Spafford to Thomas Jefferson, 4 [May] 1815 (Jefferson Papers)