Domestic & Foreign Air Mail Service. United States Post Office Department. March 1, 1939. (insets) Alaska-Canada. Hawaiian Islands. Trans-Pacific Route. Latin AmericaDomestic & Foreign Air Mail Service. United States Post Office Department. March 1, 1939Domestic & Foreign Air Mail Service. United States Post Office Department

Chicago citation style
United States Post Office Department, William & Heintz Co. Domestic & Foreign Air Mail Service. United States Post Office Department. March 1, 1939. (insets) Alaska-Canada. Hawaiian Islands. Trans-Pacific Route. Latin America,Domestic & Foreign Air Mail Service. United States Post Office Department. March 1, 1939,Domestic & Foreign Air Mail Service. United States Post Office Department. 1939. Retrieved from the Digital Public Library of America, https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~290429~90061988. (Accessed December 14, 2018.)
APA citation style
United States Post Office Department, William & Heintz Co, (1939) Domestic & Foreign Air Mail Service. United States Post Office Department. March 1, 1939. (insets) Alaska-Canada. Hawaiian Islands. Trans-Pacific Route. Latin America,Domestic & Foreign Air Mail Service. United States Post Office Department. March 1, 1939,Domestic & Foreign Air Mail Service. United States Post Office Department. Retrieved from the Digital Public Library of America, https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~290429~90061988
MLA citation style
United States Post Office Department, William & Heintz Co. Retrieved from the Digital Public Library of America <https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~290429~90061988>.
Note: These citations are programmatically generated and may be incomplete.