[Service man performing maintenance on tail rotor of the YH-40]
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[Service man performing maintenance on tail rotor of the YH-40], photograph, April 1, 1958; (digital.library.unt.edu/ark:/67531/metadc950071/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Special Collections.