State Highway Commission of Virginia (January 13, 1936). "Minutes of Meeting"(PDF) (Report). Richmond: Commonwealth of Virginia. p.8. "Route 4 at M.P. 5.9 between West Point and Shacklefords P.O."
State Highway Commission of Virginia (February 23, 1938). "Minutes of Meeting"(PDF) (Report). Richmond: Commonwealth of Virginia. p.7. "Route 33, M.P. 3.0 at Shacklefords Fork"