| [W2389] | Sigismund III of Poland, Letter of Sigismund III of Poland to Giacomo Lauro | Sigismund III of Poland, Giacomo Lauro | | Letter | Latin | 1 | 1 |
| [W2297] | Jerome of Stridon, Epistolae, Theodorus Laelius (adapter) | Theodorus Laelius, Jerome of Stridon | | Letter | Latin | 3 | 3 |
| [W2105] | Andrzej Krzycki, De negotio Prutenico Epistola | Andrzej Krzycki, Giovanni Antonio Buglio | | Letter | Latin | 1 | 1 |
| [W1782] | Francesco Filelfo, Breviores elegantioresque Epistole omnibus | Francesco Filelfo | | Letter | Latin | 1 | 1 |
| [W627] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Balthasar von Dernbach (13 March 1574) | Stanisław Hozjusz, Balthasar von Dernbach | | Letter | Latin | 2 | 1 |
| [W625] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Henry I of Poland (1574) | Stanisław Hozjusz, Henry III, king of France and Poland | | Letter | Latin | 2 | 1 |
| [W623] | Stanisław Hozjusz, Letter of Stanislaus Hosius to Catherine Jagiellon | Stanisław Hozjusz, Catherine Jagiellon | Rome | Letter | | 1 | 1 |
| [W620] | Stanisław Hozjusz, Letter of Stanislaus Hosius to Catherine Jagiellon | Stanisław Hozjusz, Catherine Jagiellon | | Letter | | 1 | 1 |
| [W619] | Stanisław Hozjusz, Letter of Stanislaus Hosius to Sigismund Vasa | Sigismund III of Poland, Stanisław Hozjusz | Rome | Letter | Latin | 1 | 1 |
| [W621] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Charles de Guise (3 April 1573) | Charles de Guise, Stanisław Hozjusz | | Letter | Latin | 2 | 1 |
| [W1247] | Cicero, Epistolarum liber decimus quartus et decimus sextus | Cicero | | Letter | Latin | 1 | 1 |
| [W626] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Carlo Borromeo | Carlo Borromeo, Stanisław Hozjusz | | Letter | Latin | 1 | 1 |
| [W632] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Carlo Borromeo | Carlo Borromeo, Stanisław Hozjusz | | Letter | Latin | 1 | 1 |
| [W449] | Friedrich von Heydeck, An den Hochwirdigen Herrn Walthern von Blettenbergk | Friedrich von Heydeck | | Letter | German | 1 | 1 |
| [W31] | Jerónimo Osório, Epistolografia | Jerónimo Osório | | Letter | Latin | 1 | |
| [W622] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Henry I of Poland (2 June 1573) | Stanisław Hozjusz, Henry III, king of France and Poland | Rome | Letter | Latin | 2 | 1 |
| [W630] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Jéronimo Osório | Stanisław Hozjusz, Jerónimo Osório | | Letter | Latin | 2 | 1 |
| [W628] | Stanisław Hozjusz, Letter of Stanisław Hozjusz to Jéronimo Osório | Stanisław Hozjusz, Jerónimo Osório | | Letter | Latin | 2 | 1 |
| [W631] | Jerónimo Osório, Letter of Jéronimo Osório to Stanisław Hozjusz | Stanisław Hozjusz, Jerónimo Osório | | Letter | Latin | 2 | 1 |
| [W624] | Jerónimo Osório, Letter of Jéronimo Osório to Stanisław Hozjusz | Stanisław Hozjusz, Jerónimo Osório | | Letter | Latin | 2 | 1 |
