印刷 品
参考 文献
[编辑]- ^ Printed Matter Rates 1848-1968. Inland Rates. Great Britain Philatelic Society. 2020 [18 September 2020]. (
原始 内容 存 档于2021-06-06). - ^ Postal Convention Between the United States of America and the Republic of Mexico; December 11, 1861. The Avalon Project. Yale Law School. [2007-06-20]. (
原始 内容 存 档于2009-04-19).
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