United States. Post Office Department
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Sources
found: Cullinan, G. The Post Office Department, 1968:p. 26, etc. (General Post Office, term first used for U.S. postal service, so called in first report of postmaster general to the Congress, 1790; Post Office Department not used until 1825)
found: Wikipedia, October 27, 2015(under United States Postal Service: the Postal Reorganization Act, signed by President Richard Nixon on August 12, 1970, replaced the cabinet-level Post Office Department with the independent United States Postal Service, and took effect on July 1, 1971)
Change Notes
1980-02-07: new
2015-10-29: revised
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