United States. Bureau of the Census. 1990 Census County Block Map (Recreated): Hidalgo County, Block 10, map, 1990; (https://texashistory.unt.edu/ark:/67531/metapth358276/m1/1/: accessed November 18, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .