Plett, Michael. 2012. "And Now There are Five: Update to "U.S. Card Proofs with Handstamped 'Specimen' Overprints"." The Chronicle of the U.S. Classic Postal Issues, 64, (2) 171–181. arrow-up Back to ...
Counterfeit Kansas-Nebraska overprints on 1922-34 issue (including 'California varieties') / compiled by Robert H. Schoen and James T. DeVoss ; plus First day covers of the Kansas-Nebraska overprints ...
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