Vatican Philatelic Society, Ufficio Philatelico e Numismatico, & Etchingham, J. Vatican stamp collection.
Lua i Stíl Chicago (17ú heag.)Vatican Philatelic Society, Ufficio Philatelico e Numismatico, agus John Etchingham. Vatican Stamp Collection.
Lua MLA (8ú heag.)Vatican Philatelic Society, et al. Vatican Stamp Collection.
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