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Scott's catalogue of United States stamps, specialized.

New York, N.Y. : Scott Publications, ©1949-©1955. 1956

Encyclopedia of United States stamps and stamp collecting

Minneapolis, Minn. : Kirk House Publishers, c2006. 2006

Stamping American memory : collectors, citizens, and the post

Brennan, Sheila Ann, author.
Ann Arbor : University of Michigan Press, 2018. 2018

The economics of universal mail post PAEA : hearing before the Subcommittee on Federal Workforce, Po

United States. Congress. House. Committee on Oversight and Government Reform. Subcommittee on Federal Workforce, Postal Service, and the District of Columbia.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2009. 2009

Implementation of the Postal Accountability Enhancement Act of 2006 : hearing before the Subcommitte

United States. Congress. House. Committee on Oversight and Government Reform. Subcommittee on Federal Workforce, Postal Service, and the District of Columbia.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2009. 2009