[Unfinished main fuselage box of the XH-40], photograph, August 6, 1956; (https://texashistory.unt.edu/ark:/67531/metadc949856/m1/1/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
[Unfinished main fuselage box of the XH-40], photograph, August 6, 1956; (https://texashistory.unt.edu/ark:/67531/metadc949856/m1/1/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .