1From James Madison to William Clark, 4 January 1804 (Madison Papers)
Letter not found. 4 January 1804, Department of State. Acknowledged in Clark to JM, 28 June 1804...
2From Thomas Jefferson to William Clark, 19 December 1807 (Jefferson Papers)
I have duly recieved your two favors of Sep. 20. and Nov. 10. and am greatly obliged indeed by...