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Out of the Vault: The Certified Plate Proof Collection

In February 2008, the National Postal Museum received a major Smithsonian grant to digitize its certified plate proof collection. In this video the Smithsonian Channel tells the story from start to finish.http://www.postalmuseum.si.edu/collectionTranscript: http://npm.si.edu/collection/CPP_Video_Transcript.pdf
Length: 02:56

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