Post was transported over water in the United States in the later nineteenth and the twentieth century. == Origins == Route agents and, later, railway post office (RPO) clerks were placed on inland boat lines at a very early date; postmarks go back to 1857.
Post was transported over water in the United States in the later nineteenth and the twentieth century. == Origins == Route agents and, later, railway post office (RPO) clerks were placed on inland boat lines at a very early date; postmarks go back to 1857.
Source: Wikipedia "Boat railway post office" · CC BY-SA 4.0
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