United States. Bureau of the Census. 1990 Census County Block Map (Recreated): Stonewall County, Block 4, map, 1990; (https://texashistory.unt.edu/ark:/67531/metapth360724/m1/1/: accessed June 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .