United States Foreign air mail : Post Office Department, December 1, 1941. Frank C. Walker, Postmaster General, Smith W. Purdum, Second Assistant Post Master General, John E. Lamiell, Second Assistant Postmaster General, George H. Grayson, Acting director, International postal Service. Map prepared by division of Topography, Bureau of Fourth Assistant Postmaster General., United States Foreign air mail

Chicago citation style
Walker, Frank C, United States. Post Office Department. United States Foreign air mail : Post Office Department, December 1, 1941. Frank C. Walker, Postmaster General, Smith W. Purdum, Second Assistant Post Master General, John E. Lamiell, Second Assistant Postmaster General, George H. Grayson, Acting director, International postal Service. Map prepared by division of Topography, Bureau of Fourth Assistant Postmaster General.,United States Foreign air mail. 1941. Retrieved from the Digital Public Library of America, https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~306219~90076601. (Accessed March 4, 2021.)
APA citation style
Walker, Frank C, United States. Post Office Department, (1941) United States Foreign air mail : Post Office Department, December 1, 1941. Frank C. Walker, Postmaster General, Smith W. Purdum, Second Assistant Post Master General, John E. Lamiell, Second Assistant Postmaster General, George H. Grayson, Acting director, International postal Service. Map prepared by division of Topography, Bureau of Fourth Assistant Postmaster General.,United States Foreign air mail. Retrieved from the Digital Public Library of America, https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~306219~90076601
MLA citation style
Walker, Frank C, United States. Post Office Department. Retrieved from the Digital Public Library of America <https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~306219~90076601>.
Note: These citations are programmatically generated and may be incomplete.