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Research Paper #18 – Printing History of Series 1922 Flat Plates Used for 2¢ Washington and Harding Memorial Sheet Stamps

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Research Paper #18 - Printing History of Series 1922 Flat Plates Used for 2¢ Washington and Harding Memorial Sheet Stamps

This research paper consists of data tables indicating when each of these plates was "at press". The tables are arranged by these "at press" dates. The printing history of the booklet pane plates is found in Research Paper #8, while the information for rotary press sheet stamps is in Research Paper #13, and that for the coil stamps is in Research Paper #14. 46 pages.

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