Territorial Groups shown in westbound Trans-Continental Tariff No. 1 Series: to illustrate trans-continental grouping in general, applicable on business destined to California., map, [1918..1924]; (https://texashistory.unt.edu/ark:/67531/metapth252117/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .