Combination Map Ore City - Longview - Kilgore District: portions of Upshur - Gregg - Rusk - Smith Counties., map, [1930..1940]; (https://texashistory.unt.edu/ark:/67531/metapth193641/m1/1/: accessed May 4, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .