[Part for the Bell 240 helicopter], photograph, September 23, 1957; (https://texashistory.unt.edu/ark:/67531/metadc950034/m1/1/: accessed April 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
[Part for the Bell 240 helicopter], photograph, September 23, 1957; (https://texashistory.unt.edu/ark:/67531/metadc950034/m1/1/: accessed April 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .