United States. Bureau of the Census. 2000 Census County Subdivison Block Map: East Grayson CCD, Texas, Block 20, map, 2000; (https://texashistory.unt.edu/ark:/67531/metapth423177/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .