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 Smithsonian National Postal Museum

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Moving the Mail : Mail by Rail : Highway Post Office Covers

Highway Post Office First Trip Covers

The only mail canceled on the inaugural trip of any highway route was philatelic mail.

Highway Post Office First Trip: Aberdeen, South Dakota to Baker, Montana
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 Highway Post Office First Trip: between Amarillo, Texas, and Roswell, New Mexico
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 Motorized Highway Post Office Service: Harrisonburg, Virginia, to Washington, D.C.
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First Trip Highway Post Office: between Louisville, Kentucky, and St. Louis, Missouri
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