Explanatory schematic of intercommunicating system
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Explanatory schematic of intercommunicating system, technical drawing, June 11, 1943; (https://texashistory.unt.edu/ark:/67531/metapth1187489/: accessed May 24, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Texas Parks & Wildlife Department.