6", 7", 8" Low Pressure Sea Valves
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6", 7", 8" Low Pressure Sea Valves, item, May 18, 1914; (https://texashistory.unt.edu/ark:/67531/metapth1141377/: accessed May 23, 2019), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Texas Parks & Wildlife Department.