| [W2750] | Martin Luther, Brief an die Christen in Riga, Reval und Dorpat | Martin Luther | | Letter | German |
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| [W632] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Carlo Borromeo (11 October 1575) | Carlo Borromeo, Stanisław Hozjusz | | Letter | Latin | |
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| [W626] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Carlo Borromeo (20 May 1573) | Carlo Borromeo, Stanisław Hozjusz | | Letter | Latin | |
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| [W631] | Jerónimo Osório, Letter of Jéronimo Osório to Stanisław Hozjusz (5 August 1575) | Stanisław Hozjusz, Jerónimo Osório | | Letter | Latin |
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| [W630] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Jéronimo Osório (15 April 1575) | Stanisław Hozjusz, Jerónimo Osório | | Letter | Latin |
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| [W624] | Jerónimo Osório, Letter of Jéronimo Osório to Stanisław Hozjusz (July 1573 - December 1573) | Stanisław Hozjusz, Jerónimo Osório | | Letter | Latin |
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| [W628] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Jéronimo Osório (15 April 1574 - 11 May 1574) | Stanisław Hozjusz, Jerónimo Osório | | Letter | Latin |
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| [W629] | Jerónimo Osório, Letter of Jéronimo Osório to Stanisław Hozjusz (8 January 1575) | Stanisław Hozjusz, Jerónimo Osório | | Letter | Latin |
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| [W2389] | Sigismund III of Poland, Letter of Sigismund III of Poland to Giacomo Lauro | Sigismund III of Poland, Giacomo Lauro | | Letter | Latin | |
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| [W2297] | Jerome of Stridon, Epistolae, Theodorus Laelius (adapter) | Theodorus Laelius, Jerome of Stridon | | Letter | Latin |
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| [W2105] | Andrzej Krzycki, De negotio Prutenico Epistola | Andrzej Krzycki, Giovanni Antonio Buglio | | Letter | Latin |
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| [W1782] | Francesco Filelfo, Breviores elegantioresque Epistole omnibus | Francesco Filelfo | | Letter | Latin |
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| [W627] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Balthasar von Dernbach (13 March 1574) | Stanisław Hozjusz, Balthasar von Dernbach | | Letter | Latin |
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| [W625] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Henry I of Poland (1574) | Stanisław Hozjusz, Henry III, king of France and Poland | | Letter | Latin |
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| [W623] | Stanisław Hozjusz, Letter of Stanislaus Hosius to Catherine Jagiellon | Stanisław Hozjusz, Catherine Jagiellon | Rome | Letter | | |
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| [W620] | Stanisław Hozjusz, Letter of Stanislaus Hosius to Catherine Jagiellon | Stanisław Hozjusz, Catherine Jagiellon | | Letter | | |
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| [W619] | Stanisław Hozjusz, Letter of Stanislaus Hosius to Sigismund Vasa | Sigismund III of Poland, Stanisław Hozjusz | Rome | Letter | Latin | |
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| [W621] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Charles de Guise (3 April 1573) | Charles de Guise, Cardinal of Lorraine, Stanisław Hozjusz | | Letter | Latin |
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| [W1247] | Cicero, Epistolarum liber decimus quartus et decimus sextus | Cicero | | Letter | Latin |
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| [W449] | Friedrich von Heydeck, An den Hochwirdigen Herrn Walthern von Blettenbergk | Friedrich von Heydeck | | Letter | German |
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