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Internet
| Collenberg, Adolf. Surrein. En: Lexicon istoric retic (geo.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Sursaissa (Obersaxen). En: Lexicon istoric retic (geo.). Versiun da stampa 2008. |
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| Gross, Manfred. Surselva Romontscha. En: Lexicon istoric retic (tem.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Surselva. En: Lexicon istoric retic (geo.). Versiun da stampa 2008. |
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| Simonett, Jürg. Surses. En: Lexicon istoric retic (geo.). Versiun da stampa 2008. |
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| Tomaschett, Carli. Sursilvan. En: Lexicon istoric retic (tem.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Susauna. En: Lexicon istoric retic (geo.). Versiun da stampa 2008. |
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| Grimm, Paul Eugen. Susch. En: Lexicon istoric retic (geo.). Versiun da stampa 2008. |
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| Bundi, Martin. Susta. En: Lexicon istoric retic (tem.). Versiun da stampa 2008. |
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| Bundi, Martin. Sutselva. En: Lexicon istoric retic (geo.). Versiun da stampa 2008. |
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