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Internet
| Wanner, Kurt. Sprecher, Jann. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Sprecher, Johann Andreas (von Bernegg). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Sprecher, Johann Andreas von. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Wanner, Kurt. Sprecher, Johann Andreas. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Sprecher, Johann [Jann] (von Bernegg). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Wanner, Kurt. Sprecher, Paul (von Bernegg). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Wanner, Kurt. Sprecher, Salomon. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Sprecher, Victor. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Bundi, Martin. Spreiter, Jacob. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Bundi, Martin. Squarcialupi, Marcello. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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