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Internet
| Sprecher, Daniel. Sprecher [von]. En: Lexicon istoric retic (fam.). Versiun da stampa 2008. |
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| Wanner, Kurt. Sprecher, Andreas (von Bernegg). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Sprecher, Andreas. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Sprecher, Andreas. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Wanner, Kurt. Sprecher, Anton Herkules. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Sprecher, Daniel. Sprecher, Arthur (von Bernegg). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Sprecher, Florian. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Sprecher, Daniel. Sprecher, Fortunat (von Bernegg). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Wanner, Kurt. Sprecher, Georg (von Bernegg). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Wanner, Kurt. Sprecher, Georg. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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