This is a map copyrighted by the Arkansas State Highway Department in 1926, showing the new numbering system. It comes from a larger map on <a rel="nofollow" class="external text" href="http://www.arkansashighways.com/planning_research/mapping_graphics/archived_tourist_maps/archived_tourist_maps.aspx">this Historic Tourist Maps – By Year section on the Arkansas State Highway and Transportation Department</a>. I searched <a rel="nofollow" class="external text" href="http://www.scils.rutgers.edu/~lesk/copyrenew.html">Copyright renewal records at http://www.scils.rutgers.edu/~lesk/copyrenew.html</a> and the ASHD did not renew any copyrights. Therefore this map is now in the public domain.
Arkansas State Highway Department
1926
<a rel="nofollow" class="external text" href="http://www.arkansashighways.com/planning_research/mapping_graphics/archived_tourist_maps/1926A.tif">Historical Maps of Arkansas at http://www.arkansashighways.com/planning_research/mapping_graphics/archived_tourist_maps/archived_tourist_maps.aspx</a>. I inverted the image to its current state using Inkscape.