United States. Bureau of the Census. 1990 Census County Block Map (Recreated): Atascosa County, Block 3, map, 1990; (https://texashistory.unt.edu/ark:/67531/metapth362462/m1/1/: accessed October 15, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .