The Winton M. Blount Postal History Symposia: Select Papers from the Seventh, Eighth, and Ninth SymposiaDOI: info:10.5479/si.13073186.v2Smithsonian Institutions Scholarly Press142
Smith, Susan N., editor. 2020. The Winton M. Blount Postal History Symposia: Select Papers from the Seventh, Eighth, and Ninth Symposia. Washington, DC: Smithsonian Institutions Scholarly Press. In Smithsonian Contributions to History and Technology, 58. https://doi.org/10.5479/si.13073186.v2.