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Quellen und Badeorte in der Philatelie / von S. Gutmann.

Sanitary fairs : a philatelic and historical study of Civil War benevolences / by Alvin Robert Kantor and Marjorie Sered Kantor.

Disinfected mail : [historical review and tentative listing of cachets, handstamp markings, wax seals, wafer seals and manuscript certifications alphabetically arranged according to countries / In collaboration with C. Ravasini and others.

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Quellen und Badeorte in der Philatelie / von S. Gutmann.

Sanitary fairs : a philatelic and historical study of Civil War benevolences / by Alvin Robert Kantor and Marjorie Sered Kantor.

Disinfected mail : [historical review and tentative listing of cachets, handstamp markings, wax seals, wafer seals and manuscript certifications alphabetically arranged according to countries / In collaboration with C. Ravasini and others.