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The Swedish Tiger’s US Stamp Site An illustrated Guide
Siegel Encyclopedia – 1847 Issue
The 1847 Issue – A Brief Synopsis , by Calvet M. Hahn
An 1847 Cover to Think About, by Calvet M. Hahn
Certifiably Genuine? : Even The Experts Can—And Do—Change Their Minds, by Calvet M. Hahn
1847 Issue – Reexamining the Colors Part 1, by Calvet M. Hahn
1847 Issue – Reexamining the Colors Part 2, by Calvet M. Hahn
1847 Issue – Reexamining the Colors Part 3, by Calvet M. Hahn
1847 Issue – Reexamining the Colors Part 4, by Calvet M. Hahn
1847 Issue – Reexamining the Colors Part 5, by Calvet M. Hahn
1847 Issue – Reexamining the Colors Part 6, by Calvet M. Hahn
1847 Issue – Cross-Border Postal History Part 1, by Calvet M. Hahn
1847 Issue – Cross-Border Postal History Part 2, by Calvet M. Hahn
1847 Issue – Cross-Border Postal History Part 3, by Calvet M. Hahn