Department of Planning (May 2017). "State Primary Road System Maps". Frankfort, KY: Kentucky Transportation Cabinet. Retrieved May 11, 2017.
Department of Planning (February 19, 2016). "Allen County State Primary Road System"(PDF). Frankfort, KY: Kentucky Transportation Cabinet. Retrieved May 11, 2017.
Department of Planning (April 5, 2012). "Owen County State Primary Road System"(PDF). Frankfort, KY: Kentucky Transportation Cabinet. Retrieved May 11, 2017.