^Planning and Research Division (2010). "Arkansas Road Log Database". Arkansas State Highway and Transportation Department. Archived from the original(Database) on June 23, 2011. Retrieved June 9, 2011.
^ abAN ACT To provide for the administration and maintenance of the Natchez Trace Parkway, in the States of Mississippi, Alabama, and Tennessee, by the Secretary of the Interior, and for other purposes. 52 Stat.407, enacted 18 May 1938.