United States Postal Service. History of the United States Postal Service: 1775-1993.
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Cita Chicago Style (17a ed.)
United States Postal Service. History of the United States Postal Service: 1775-1993.
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Cita MLA (9a ed.)
United States Postal Service. History of the United States Postal Service: 1775-1993.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.