1John Breck Treat to Thomas Jefferson, 31 March 1809 (Jefferson Papers)
Arkansas River [index entry]
2John Bradbury to Thomas Jefferson, 5 March 1812 (Jefferson Papers)
Arkansas River [index entry]
3To James Madison from Zebulon Montgomery Pike, 10 July 1812 (Madison Papers)
...search for the headwaters of the Red and Arkansas Rivers in 1806, when he found occasion to...
4To James Madison from William L. Lovely, September 1815 (Madison Papers)
White & Arkansas River Togather with leave that in Case in thier Excursion the...