[XH-40 #3 with cargo sling], photograph, November 21, 1957; (https://texashistory.unt.edu/ark:/67531/metadc949914/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
[XH-40 #3 with cargo sling], photograph, November 21, 1957; (https://texashistory.unt.edu/ark:/67531/metadc949914/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .