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Internet
| Bundi, Martin. Töndury, Hans. En: Lexicon istoric retic (bio.). Versiun da stampa 2009. |
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| Margadant, Silvio. Töndury, Otto Theodor. En: Lexicon istoric retic (bio.). Versiun da stampa 2009. |
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| Collenberg, Adolf. Tortura. En: Lexicon istoric retic (tem.). Versiun da stampa 2009. |
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| Hilfiker, Max. Traffic e transit. En: Lexicon istoric retic (tem.). Versiun da stampa 2009. |
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| Wieser, Constant. Travers, Gian. En: Lexicon istoric retic (bio.). Versiun da stampa 2009. |
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| Collenberg, Adolf. Travers, Johann Rudolf (von Ortenstein). En: Lexicon istoric retic (bio.). Versiun da stampa 2009. |
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| Von Tscharner, Ada. Travers, Johann Victor (von Ortenstein). En: Lexicon istoric retic (bio.). Versiun da stampa 2009. |
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| Bundi, Martin. Travers, Johann Victor III (von Ortenstein). En: Lexicon istoric retic (bio.). Versiun da stampa 2009. |
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| Collenberg, Adolf. Travers, Johann Viktor (von Ortenstein). En: Lexicon istoric retic (bio.). Versiun da stampa 2009. |
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| Von Tscharner, Ada. Travers, Johann Viktor I (von Ortenstein). En: Lexicon istoric retic (bio.). Versiun da stampa 2009. |
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