American Independent presidential election results by county (1968). Colors based on Colorbrewer 2.0.
<ul><li><a rel="nofollow" class="external free" href="http://www.nhgis.org">http://www.nhgis.org</a></li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Tilden76" title="User:Tilden76">Tilden76</a></li></ul>
CC BY-SA 4.0
<p><span class="int-own-work" lang="en">Own work</span>. Original shapefile downloaded from:
</p>
Minnesota Population Center. National Historical Geographic Information System: Version 2.0. Minneapolis, MN: University of Minnesota 2011. <a rel="nofollow" class="external free" href="http://www.nhgis.org">http://www.nhgis.org</a>