Keep 'em flying! : presented by the United States Army Recruiting Service.
Keep 'em flying! : presented by the United States Army Recruiting Service., poster, 1941; Governors Island, New York. (https://digital.library.unt.edu/ark:/67531/metadc577/: accessed March 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.