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Internet
| Simonett, Jürg. Planta, Peter von (Wildenberg). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Gredig, Hansjürg. Planta, Peter von. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Gredig, Hansjürg. Planta, Peter. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Planta, Robert von. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Planta, Rudolf Alexander. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Planta, Rudolf von (Samedan). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Gredig, Hansjürg. Planta, Rudolf von (Wildenberg). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Bundi, Martin. Planta, Rudolf. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Deplazes-Haefliger, Anna-Maria. Planta, Thomas. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Surchat, Pierre. Planta, Thomas. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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