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Founded in 1950 by a group of philatelists interested in the study of Highway Post Offices and Railway Post Offices of the United States. Contact: Douglas N. Clark, Box 427, Marston Mills, MA 02648 Website:https://www.eskimo.com/~rkunz/mposhome.html?fbclid=IwAR2bzvDq0MYf1pO5F5mts_khk_hk8mmfnG07yT2xJ_S4EZ8MS6_0HDeK9HkFacebook page:https://www.facebook.com/Mobile-Post-Office-Society244841978906108/Highway Post Office buses:https://postalmuseum.si.edu/exhibits/current/moving-the-mail/mail-by-rail/highway-post-office-buses/index.htmlHighway Post Office first-trip covers:https://postalmuseum.si.edu/exhibits/current/moving-the-mail/mail-by-rail/highway-post-office-buses/highway-post-office-first-tripcovers.htmlBaker, David, Postal History of Indiana, Volume II. L.H. Hartmann, 1976. Chapter 18 deals with Highway Post Offices in Indiana. Bruns, James H. The First Highway Post Office. Mobile Post Office Society, 1985.%u201cThe Highway Post Office,%u201d Indiana Postal History Society Newsletter, Vol. 34, No. 1 (January-March 2019).Mobile Post Office Society, United States Highway Post Office Cover Catalog. Mobile Post Office Society, 1987.Transit Postmark Collector, the official publication of the Mobile Post Office Society. Various back issues deal with specific details of the Highway Post Office routes.