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| APS Affiliate #103 |
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| ATA Chapter #94 |
Segal: Errors, Freaks and Oddities on U.S. Stamps
Page: 23
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Keywords: stamp errors, Yorktown issue, misregistered plate block, grounded plane, color errors, 1938, Presidential issue, lamp black, Bureau of Engraving and Printing, hydrogen sulfite
John M. Hotchner
Errors, Freaks & Oddities
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