Mobile Post Office Society
Non-profit organization
02648 Marstons Mills
United States
Website: http://www.eskimo.com/~rkunz/mposhome.html
Mobile Post Office Society (MPOS) was founded in 1950 by a group of philatelists interested in the study of United States Highway Post Offices. It soon expanded to focus on Railway Post Offices, and eventually to the enroute distribution and postmarking o



