United States. Bureau of the Census. P.L. 94-171 County Block Map (2010 Census): Williamson County, Index, map, January 12, 2011; (https://texashistory.unt.edu/ark:/67531/metapth381411/m1/1/: accessed April 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .