Heavier-than-air- Airship Page: 1 of 3
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Heavier-than-air- Airship, patent, September 2, 1919; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1258217/m1/1/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.