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| | National Postal Museum |
 | | Under the appropriate, newly defined department headings, objects are classified as master example, the Museum's best examples of mint, used and unused stamps; reference example, the second-best examples of mint or unused stamps on permanent exhibit in the Philatelic Gallery; oddity; or significant item, rare, one-of-a-kind, unique and/or historically important. |
 | | The Bureau Plate Proofs, loosely termed a department, contains approximately 40,000 proofs printed from the original plates of the Bureau of Engraving and Printing that were certified (approved, signed and dated) by Bureau and Post Office officials. |
 | | Archival documents are those papers and maps relevant to the organization and functioning of the United States Post Office Department, its branches, post offices and staff. |
| www.postalmuseum.si.edu /collection/3a_about.html (1303 words) |
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