1860-1900s a collection of 3 Urtuu official mails of Urga Amban, applied with red seals. With English introduction.
1860-1900s a collection of 3 Urtuu official mails of Urga Amban, applied with red seals. With English introduction.1860至1900年一組三件往來於庫倫大臣之驛站公文，鈐紅色戳記，附英文介紹。
