[Bell Helicopter 429 model], photograph, November 27, 2017; (https://texashistory.unt.edu/ark:/67531/metadc1633979/m1/1/: accessed June 13, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
[Bell Helicopter 429 model], photograph, November 27, 2017; (https://texashistory.unt.edu/ark:/67531/metadc1633979/m1/1/: accessed June 13, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .