United States. Post Office Dept. (1949). Postage stamps of the United States: Issued by the Post Office Department from July 1, 1847, to June 30, 1949. Govt. Print. Office.
MLA CitationUnited States. Post Office Dept. Postage Stamps of the United States: Issued by the Post Office Department from July 1, 1847, to June 30, 1949. Govt. Print. Office, 1949.
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