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Research Paper #25 - Prominent Americans Series: Bureau Precancel Printing History
Rob Loeffler has been researching the production of Bureau of Engraving and Printing precancels on the Prominent American Series and has made a complete and thorough compilation of the Bureau applied precancels which includes all 24 issues precanceled. The information given includes plate numbers, precancel types, dates to press (including reprintings) as well as first and final printings. The information gathered from the United States Specialist precancel listings by monthly columns. The research is compiled in 28 pages available in PDF format.